ioapibuf.h already gets all needed zlib types (uLong, voidpf,
zlib_filefunc_def, OF macro) through ioapi.h which includes zlib.h.
The relative ../../zlib.h include was a duplicate and creates an
unnecessary hard dependency on the vendored zlib directory layout.

When use_system_zlib is set, link against system -lz and force-include
zlib_addon.h so the patched vendored minizip sources still see the
addon flags. The vendored minizip is kept as it has OnlyOffice-specific
patches (ioapibuf, disabled CRC check, read-only open mode flag).

Create centralized cryptopp.pri with use_system_cryptopp flag,
replacing ad-hoc CRYPTOPP_DISABLE_ASM defines and -lCryptoPPLib
links scattered across 7 consumer .pro files.
Change all #include paths from relative vendored paths to portable
<cryptopp/foo.h> form, which works for both vendored (via INCLUDEPATH
pointing to Common/3dParty/) and system (/usr/include/cryptopp/)
headers.
CRYPTOPP_DISABLE_ASM is only defined for vendored builds to avoid
ODR violations when linking against a system library built with
ASM enabled.

Wrap vendored include/library paths in !use_system_boost guard.
When using system boost, link without -L paths since system libs
are in the default search path. Compiler flags (enum constexpr
warnings, ARM64 defines) remain unconditional as they apply
regardless of boost source.

When use_system_icu is set, link against system -licuuc -licudata
without vendored include/library paths. All platform-specific
vendored ICU configuration (Windows, Linux, macOS, iOS, Android)
is wrapped in the else branch.

Create harfbuzz.pri with use_system_harfbuzz guard. When set,
link against system -lharfbuzz. Otherwise include the generated
harfbuzz_sources.pri from make.py.
Update make.py to write to harfbuzz_sources.pri instead of
harfbuzz.pri so the git-tracked file is not overwritten.
Update .gitignore to track harfbuzz.pri and ignore the generated
harfbuzz_sources.pri.

When use_system_heif is set, link against system -lheif -lde265
-lx265 without vendored paths or static build defines. All
platform-specific vendored library paths (Windows, Linux/Android,
macOS/iOS) are wrapped in the else branch.

When use_system_v8 is set, link against system libv8_monolith
from /usr/lib with headers from /usr/include/v8 (as provided by
the chromium-v8-dev package).
Defines V8_VERSION_89_PLUS, V8_VERSION_121_PLUS,
V8_COMPRESS_POINTERS, and DISABLE_MEMORY_LIMITATION for
compatibility with modern V8 (12.1+).
Add V8_VERSION_121_PLUS guards for API changes:
- Inspector connect() requires additional trust/debugger params
- VisitHandlesWithClassIds() was removed

Change from vendored relative path to <libheif/heif.h> which
works with both system libheif (/usr/include/libheif/heif.h)
and vendored libheif (via INCLUDEPATH from heif.pri).

GCC 14+ treats -Wincompatible-pointer-types as an error. The
jasper code used int* where jpc_fix_t* (long int* on 64-bit) was
expected. Fix the function declarations, definitions, and struct
typedef to use jpc_fix_t consistently:
- jpc_ft_synthesize() parameter in jpc_qmfb.c
- analyze/synthesize function pointers in jpc_qmfb2d_t struct
- jpc_tsfb_analyze2/synthesize2() parameters in jpc_tsfb.c
These changes are backward compatible with older GCC as they
correct the types to match actual usage on all architectures.

pole.cpp: Replace wide string literals (L"...") with narrow ones
when outputting to std::cout. GCC 15 libstdc++ deletes the
operator<<(ostream, wchar_t*) overload as mixing narrow/wide
streams is undefined behavior.
v8_base: Add V8Holder compat macro that maps to This() on
V8 12.1+ (where Holder() was removed) and Holder() on older V8.
Replace all Holder() calls in v8_base.h and v8_base.cpp.
inspector/utils.cpp: Use v8::Isolate::GetCurrent() instead of
Context::GetIsolate() which was removed in newer V8.

When use_system_v8 is set, link against system libv8 from /usr/lib
with headers from /usr/include/v8 (as provided by the nodejs-22-libv8
package which extracts V8 from Node.js).
Defines V8_VERSION_89_PLUS, V8_VERSION_121_PLUS, and
DISABLE_MEMORY_LIMITATION for compatibility with modern V8 (12.1+).
Node.js V8 does not enable pointer compression by default, so
V8_COMPRESS_POINTERS is not defined. V8_SUPPORT_SNAPSHOTS is also
not defined as snapshots require sdkjs compiled from source.

The zlip_set_addition_flag and zlip_get_addition_flag functions
are used across shared library boundaries (defined in libkernel.so,
called by consumers). Add extern "C" guards so C++ callers use the
correct C linkage, and add explicit default visibility to ensure
they are exported from the shared library built with
-fvisibility=hidden.

When use_system_googletest is set, link against system -lgtest
(and optionally -lgtest_main, -lgmock) instead of compiling
vendored sources. All vendored source compilation is wrapped
in the else branch.
Add core_no_gtest_main and core_gmock config flags to control
gtest_main and gmock inclusion, replacing per-project
SOURCES -= hacks that break under use_system_googletest.
Migrate cfcpp/test, OOXML/test, and OdfFile/Test/test_odf to
use the central googletest.pri with the new config flags.