bpo-31333: Re-implement ABCMeta in C (#5273)
This adds C versions of methods used by ABCMeta that
improve performance of various ABC operations.
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index bf4131e..90330fa 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -228,6 +228,7 @@
<ClInclude Include="$(zlibDir)\zutil.h" />
</ItemGroup>
<ItemGroup>
+ <ClCompile Include="..\Modules\_abc.c" />
<ClCompile Include="..\Modules\_asynciomodule.c" />
<ClCompile Include="..\Modules\_bisectmodule.c" />
<ClCompile Include="..\Modules\_blake2\blake2module.c" />