Fix FileVersionInfo build

I was trying to copy the referenced assembly too soon in the build. Need to move the target to later in the build.


Commit migrated from dotnet/corefx@53d5973

src/libraries/System.Diagnostics.FileVersionInfo/tests/System.Diagnostics.FileVersionInfo.Tests/System.Diagnostics.FileVersionInfo.Tests.csproj

@@ -45,7 +45,7 @@
     </ProjectReference>
   </ItemGroup>
   <Target Name="MangleTestAssemblyExtension"
-          AfterTargets="CopyFilesToOutputDirectory">
+          AfterTargets="PrepareForRun">
     <!-- Copy TestAssembly to file without .dll extension so that ILC preserves it as a data file rather than feeding it to the output executable. -->
     <Copy SourceFiles="$(TestPath)\System.Diagnostics.FileVersionInfo.TestAssembly.dll" DestinationFiles="$(TestPath)\System.Diagnostics.FileVersionInfo.TestAssembly.ildll" />
   </Target>