Fix Mac integration tests: don't append a line to Firestore core cmake file in build_desktop.py (#242)

* Remove append from build_desktop.py as it breaks things on Mac.

Author: jonsimantov

scripts/gha/build_desktop.py

@@ -228,12 +228,6 @@ def main():
   cmake_configure(args.build_dir, args.arch, args.msvc_runtime_library, args.linux_abi,
                   args.build_tests, args.config, args.target_format)
 
-  # Small workaround before build, turn off -Werror=sign-compare for a specific Firestore core lib.
-  if not utils.is_windows_os():
-    append_line_to_file(os.path.join(args.build_dir,
-                                     'external/src/firestore/Firestore/core/CMakeLists.txt'),
-                            'set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=sign-compare")')
-
   # CMake build
   # cmake --build build -j 8
   cmd = ['cmake', '--build', args.build_dir, '-j', str(os.cpu_count()),