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I'm surprised by the test_codecencodings_iso2022 failures. Example:
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FAIL: test_incrementaldecoder (test.test_codecencodings_iso2022.Test_ISO2022_KR)
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Traceback (most recent call last):
 File "E:\GitHub\cpython\lib\test\multibytecodec_support.py", line 208, in test_incrementaldecoder
 self.assertEqual(ostream.getvalue(), self.tstring[1])
AssertionError: b'\xe[334 chars]\x80\n\xed\x9a\xa8\xec\x9c\xa8\xec\xa0\x81\xec[1668 chars]4.\n' != b'\xe[334 chars]\x80\r\n\xed\x9a\xa8\xec\x9c\xa8\xec\xa0\x81\x[1682 chars]\r\n'
It looks like Python uses the wrong encoding to decode stdout of child processes:
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ERROR: test_build_ext (distutils.tests.test_build_ext.BuildExtTestCase)
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Traceback (most recent call last):
 File "E:\GitHub\cpython\lib\distutils\tests\test_build_ext.py", line 61, in test_build_ext
 cmd.run()
 File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 338, in run
 self.build_extensions()
 File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 447, in build_extensions
 self._build_extensions_serial()
 File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 472, in _build_extensions_serial
 self.build_extension(ext)
 File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 532, in build_extension
 depends=ext.depends)
 File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 306, in compile
 self.initialize()
 File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 199, in initialize
 vc_env = _get_vc_env(plat_spec)
 File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 92, in _get_vc_env
 universal_newlines=True,
 File "E:\GitHub\cpython\lib\subprocess.py", line 636, in check_output
 **kwargs).stdout
 File "E:\GitHub\cpython\lib\subprocess.py", line 705, in run
 stdout, stderr = process.communicate(input, timeout=timeout)
 File "E:\GitHub\cpython\lib\subprocess.py", line 1062, in communicate
 stdout = self.stdout.read()
 File "E:\GitHub\cpython\lib\encodings\cp1252.py", line 23, in decode
 return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 49: character maps to <undefined>
It would help to add a print() to lib\distutils\_msvccompiler.py:92 to get the executed command, then run manually the command, and see non-ASCII characters in the output.