Apply fix for NuGet warning

\n\nCommit migrated from fb3187b34f

src/Razor/Microsoft.NET.Sdk.Razor/src/Microsoft.NET.Sdk.Razor.csproj

@@ -36,6 +36,8 @@
     <Compile Include="..\Microsoft.AspNetCore.Razor.Tools\Client.cs">
       <Link>Shared\Client.cs</Link>
     </Compile>
+
+    <Content Include="_._" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
   <Target Name="LayoutDependencies" BeforeTargets="Build" Condition="'$(IsInnerBuild)' != 'true'">

src/Razor/Microsoft.NET.Sdk.Razor/src/Microsoft.NET.Sdk.Razor.nuspec

@@ -8,6 +8,7 @@
     <file src="Sdk\*" target="Sdk" />
     <file src="build\**" target="build" />
     <file src="buildMultiTargeting\**" target="buildMultiTargeting" />
+    <file src="_._" target="lib\netstandard2.0\_._" />
 
     <file src="$outputPath$\**" target="\" />
   </files>