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I've started to notice that CPython's builds on Windows now simetimes fail with something like this:
(both Azure and Github Actions are affected)
```
Using "C:\Program Files (x86)\Microsoft Visual Studio2019円\Enterprise\MSBuild\Current\Bin\msbuild.exe" (found in the Visual Studio installation)
Using py -3.9 (found 3.9 with py.exe)
D:\a\cpython\cpython>"C:\Program Files (x86)\Microsoft Visual Studio2019円\Enterprise\MSBuild\Current\Bin\msbuild.exe" "D:\a\cpython\cpython\PCbuild\pcbuild.proj" /t:Build /m /nologo /v:m /clp:summary /p:Configuration=Release /p:Platform=Win32 /p:IncludeExternals=true /p:IncludeCTypes=true /p:IncludeSSL=true /p:IncludeTkinter=true /p:UseTestMarker= /p:GIT="C:\Program Files\Git\bin\git.exe" 
 _freeze_module.c
 config_minimal.c
 atexitmodule.c
 faulthandler.c
 gcmodule.c
 getbuildinfo.c
 posixmodule.c
 signalmodule.c
 _tracemalloc.c
 _iomodule.c
 bufferedio.c
 bytesio.c
 fileio.c
 iobase.c
 stringio.c
 textio.c
 winconsoleio.c
 abstract.c
 accu.c
 boolobject.c
 Compiling...
 bytearrayobject.c
 bytes_methods.c
 bytesobject.c
 call.c
 capsule.c
 cellobject.c
 classobject.c
 codeobject.c
 complexobject.c
 descrobject.c
 dictobject.c
 enumobject.c
 exceptions.c
 fileobject.c
 floatobject.c
 frameobject.c
 funcobject.c
 genericaliasobject.c
 genobject.c
 interpreteridobject.c
 Compiling...
 iterobject.c
 listobject.c
 longobject.c
 memoryobject.c
 methodobject.c
 moduleobject.c
 namespaceobject.c
 object.c
 obmalloc.c
 odictobject.c
 picklebufobject.c
 rangeobject.c
 setobject.c
 sliceobject.c
 structseq.c
 tupleobject.c
 typeobject.c
 unicodectype.c
 unicodeobject.c
 unionobject.c
 Compiling...
 weakrefobject.c
 myreadline.c
 parser.c
 peg_api.c
 pegen.c
 string_parser.c
 token.c
 tokenizer.c
 getpathp.c
 invalid_parameter_handler.c
 msvcrtmodule.c
 winreg.c
 _warnings.c
 asdl.c
 ast.c
 ast_opt.c
 ast_unparse.c
 bltinmodule.c
 bootstrap_hash.c
 ceval.c
D:\a\cpython\cpython\Python\ceval.c(3669,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\_freeze_module.vcxproj]
D:\a\cpython\cpython\Python\ceval.c(3777,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\_freeze_module.vcxproj]
 Compiling...
 codecs.c
 compile.c
 context.c
 dtoa.c
 dynamic_annotations.c
 dynload_win.c
 errors.c
 fileutils.c
 formatter_unicode.c
 frame.c
 future.c
 getargs.c
 getcompiler.c
 getcopyright.c
 getopt.c
 getplatform.c
 getversion.c
 hamt.c
 hashtable.c
 import.c
 Compiling...
 importdl.c
 initconfig.c
 marshal.c
 modsupport.c
 mysnprintf.c
 mystrtoul.c
 pathconfig.c
 preconfig.c
 pyarena.c
 pyctype.c
 pyfpe.c
 pyhash.c
 pylifecycle.c
 pymath.c
 pystate.c
 pystrcmp.c
 pystrhex.c
 pystrtod.c
 Python-ast.c
 pythonrun.c
 Compiling...
 Python-tokenize.c
 pytime.c
 specialize.c
 structmember.c
 suggestions.c
 symtable.c
 sysmodule.c
 thread.c
 traceback.c
 Creating library D:\a\cpython\cpython\PCbuild\win32\_freeze_module.lib and object D:\a\cpython\cpython\PCbuild\win32\_freeze_module.exp
 Generating code
 Finished generating code
 _freeze_module.vcxproj -> D:\a\cpython\cpython\PCbuild\win32\_freeze_module.exe
 Updated files: __hello__.h
 Killing any running python.exe instances...
 Regenerate pycore_ast.h pycore_ast_state.h Python-ast.c
 D:\a\cpython\cpython\Python\Python-ast.c, D:\a\cpython\cpython\Include\internal\pycore_ast.h, D:\a\cpython\cpython\Include\internal\pycore_ast_state.h regenerated.
 Regenerate opcode.h opcode_targets.h
 Include\opcode.h regenerated from Lib\opcode.py
 Jump table written into Python\opcode_targets.h
 Regenerate token-list.inc token.h token.c token.py
 Generated sources are up to date
 Getting build info from "C:\Program Files\Git\bin\git.exe"
 Building heads/main-dirty:7dacb70 main
 _abc.c
 _bisectmodule.c
 blake2module.c
 blake2b_impl.c
 blake2s_impl.c
 _codecsmodule.c
 _collectionsmodule.c
 _contextvarsmodule.c
 _csv.c
 _functoolsmodule.c
 _heapqmodule.c
 _json.c
 _localemodule.c
 _lsprof.c
 _math.c
 _pickle.c
 _randommodule.c
 sha3module.c
 _sre.c
 _stat.c
 Compiling...
 _struct.c
 _weakref.c
 arraymodule.c
 atexitmodule.c
 audioop.c
 binascii.c
 cmathmodule.c
 _datetimemodule.c
 errnomodule.c
 faulthandler.c
 gcmodule.c
 itertoolsmodule.c
 main.c
 mathmodule.c
 md5module.c
 mmapmodule.c
 _opcode.c
 _operator.c
 posixmodule.c
 rotatingtree.c
 Compiling...
 sha1module.c
 sha256module.c
 sha512module.c
 signalmodule.c
 _statisticsmodule.c
 symtablemodule.c
 _threadmodule.c
 _tracemalloc.c
 _typingmodule.c
 timemodule.c
 xxsubtype.c
 _xxsubinterpretersmodule.c
 fileio.c
 bytesio.c
 stringio.c
 bufferedio.c
 iobase.c
 textio.c
 winconsoleio.c
 _iomodule.c
 Compiling...
 _codecs_cn.c
 _codecs_hk.c
 _codecs_iso2022.c
 _codecs_jp.c
 _codecs_kr.c
 _codecs_tw.c
 multibytecodec.c
 _winapi.c
 abstract.c
 accu.c
 boolobject.c
 bytearrayobject.c
 bytes_methods.c
 bytesobject.c
 call.c
 capsule.c
 cellobject.c
 classobject.c
 codeobject.c
 complexobject.c
 Compiling...
 descrobject.c
 dictobject.c
 enumobject.c
 exceptions.c
 fileobject.c
 floatobject.c
 frameobject.c
 funcobject.c
 genericaliasobject.c
 genobject.c
 interpreteridobject.c
 iterobject.c
 listobject.c
 longobject.c
 memoryobject.c
 methodobject.c
 moduleobject.c
 namespaceobject.c
 object.c
 obmalloc.c
 Compiling...
 odictobject.c
 picklebufobject.c
 rangeobject.c
 setobject.c
 sliceobject.c
 structseq.c
 tupleobject.c
 typeobject.c
 unicodectype.c
 unicodeobject.c
 unionobject.c
 weakrefobject.c
 myreadline.c
 tokenizer.c
 token.c
 pegen.c
 parser.c
 string_parser.c
 peg_api.c
 invalid_parameter_handler.c
 Compiling...
 winreg.c
 config.c
 getpathp.c
 msvcrtmodule.c
 pyhash.c
 _warnings.c
 asdl.c
 ast.c
 ast_opt.c
 ast_unparse.c
 bltinmodule.c
 bootstrap_hash.c
 ceval.c
D:\a\cpython\cpython\Python\ceval.c(3669,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
D:\a\cpython\cpython\Python\ceval.c(3777,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
 codecs.c
 compile.c
 context.c
 dynamic_annotations.c
 dynload_win.c
 errors.c
 fileutils.c
 Compiling...
 formatter_unicode.c
 frame.c
 frozen.c
 future.c
 getargs.c
 getcompiler.c
 getcopyright.c
 getopt.c
 getplatform.c
 getversion.c
 hamt.c
 hashtable.c
 import.c
 importdl.c
 initconfig.c
 marshal.c
 modsupport.c
 mysnprintf.c
 mystrtoul.c
 pathconfig.c
 Compiling...
 preconfig.c
 pyarena.c
 pyctype.c
 pyfpe.c
 pylifecycle.c
 pymath.c
 pytime.c
 pystate.c
 pystrcmp.c
 pystrhex.c
 pystrtod.c
 dtoa.c
 Python-ast.c
 Python-tokenize.c
 pythonrun.c
 specialize.c
 suggestions.c
 structmember.c
 symtable.c
 sysmodule.c
 Compiling...
 thread.c
 traceback.c
 zlibmodule.c
 adler32.c
 compress.c
 crc32.c
 deflate.c
 infback.c
 inffast.c
 inflate.c
 inftrees.c
 trees.c
 uncompr.c
 zutil.c
 dl_nt.c
 getbuildinfo.c
C:\Program Files (x86)\Windows Kits10円\Include10円.0.22000.0\um\winnt.h(253): error RC2188: D:\a\cpython\cpython\PCbuild\obj311円win32_Release\pythoncore\RCa05056(47) : fatal error RC1116: RC terminating after preprocessor errors [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
 
Build FAILED.
D:\a\cpython\cpython\Python\ceval.c(3669,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\_freeze_module.vcxproj]
D:\a\cpython\cpython\Python\ceval.c(3777,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\_freeze_module.vcxproj]
D:\a\cpython\cpython\Python\ceval.c(3669,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
D:\a\cpython\cpython\Python\ceval.c(3777,13): warning C4018: '>=': signed/unsigned mismatch [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
C:\Program Files (x86)\Windows Kits10円\Include10円.0.22000.0\um\winnt.h(253): error RC2188: D:\a\cpython\cpython\PCbuild\obj311円win32_Release\pythoncore\RCa05056(47) : fatal error RC1116: RC terminating after preprocessor errors [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
 4 Warning(s)
 1 Error(s)
```
Links:
- https://github.com/python/cpython/runs/3620202822
- https://dev.azure.com/Python/cpython/_build/results?buildId=87889&view=logs&j=91c152bd-7320-5194-b252-1404e56e2478&t=c7e99cd8-4756-5292-d34b-246ff5fc615f