MSBuild: Force SHA256 source file hashes

Works around disassembly view being broken in Clang-CL builds.

See https://developercommunity.visualstudio.com/t/Debugger-disassembly-view-fails-with-cla/11123599

dep/vsprops/Base.props

@@ -36,7 +36,7 @@
       <!-- Force ThinLTO for Release builds, MSVC doesn't seem to do it otherwise. -->
       <AdditionalOptions Condition="$(Configuration.Contains(Clang)) And $(Configuration.Contains(ReleaseLTCG))"> -flto=thin %(AdditionalOptions)</AdditionalOptions>
       <DisableSpecificWarnings Condition="!$(Configuration.Contains(Clang))">4324;%(DisableSpecificWarnings)</DisableSpecificWarnings>
-      <AdditionalOptions Condition="$(Configuration.Contains(Clang))">%(AdditionalOptions) -Wno-invalid-offsetof -Wstrict-aliasing</AdditionalOptions>
+      <AdditionalOptions Condition="$(Configuration.Contains(Clang))">%(AdditionalOptions) /ZH:SHA_256 -Wno-invalid-offsetof -Wstrict-aliasing</AdditionalOptions>
       <AdditionalOptions Condition="$(Configuration.Contains(Clang)) And !$(Configuration.Contains(Debug))">%(AdditionalOptions) -fstrict-aliasing</AdditionalOptions>
       <ExceptionHandling>false</ExceptionHandling>
       <RuntimeTypeInfo>false</RuntimeTypeInfo>