message: Pass /bigobj when compiling vk_serialise.cpp to fix VS2019
diff: <ClCompile Include="vk_rendermesh.cpp" />
  <ClCompile Include="vk_rendertext.cpp" />
  <ClCompile Include="vk_rendertexture.cpp" />
  - <ClCompile Include="vk_serialise.cpp" />
  + <ClCompile Include="vk_serialise.cpp">
  + <AdditionalOptions>/bigobj %(AdditionalOptions)</AdditionalOptions>
  + </ClCompile>
  <ClCompile Include="vk_shaderdebug.cpp" />
  <ClCompile Include="vk_shader_cache.cpp" />
  <ClCompile Include="vk_sparse_initstate.cpp" />
  