Enable MultiProcessorCompilation (#5804)

Author: Trenly

src/Directory.Build.props

@@ -17,6 +17,11 @@
       <PreprocessorDefinitions>$(WinGetMacros)%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
+    </ClCompile>
+  </ItemDefinitionGroup>
 
   <!-- For C# -->
   <PropertyGroup Condition="'$(WinGetMacros)' != ''">

src/Xlang/UndockedRegFreeWinRT/src/UndockedRegFreeWinRT/UndockedRegFreeWinRT/UndockedRegFreeWinRT.vcxproj

@@ -317,7 +317,7 @@
     <ClCompile Include="catalog.cpp" />
     <ClCompile Include="dllmain.cpp" />
     <ClCompile Include="typeresolution.cpp" />
-    <ClCompile Include="typeresolution.h" />
+    <ClInclude Include="typeresolution.h" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="catalog.h" />

src/Xlang/UndockedRegFreeWinRT/src/UndockedRegFreeWinRT/UndockedRegFreeWinRT/UndockedRegFreeWinRT.vcxproj.filters

@@ -28,9 +28,6 @@
     <ClCompile Include="dllmain.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="typeresolution.h">
-      <Filter>Header Files</Filter>
-    </ClCompile>
     <ClCompile Include="typeresolution.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
@@ -54,6 +51,9 @@
     <ClInclude Include="..\..\..\..\..\WinGetServer\Utils.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="typeresolution.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Natvis Include="$(MSBuildThisFileDirectory)..\..\natvis\wil.natvis" />