Work around failure to load correct compiler in RepoToolset

See dotnet/roslyn-tools#154

src/Tools/SyntaxVisualizer/Roslyn.SyntaxVisualizer.Control/Roslyn.SyntaxVisualizer.Control.csproj

@@ -1,5 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
-    <PropertyGroup>
+  <!-- workaround for https://github.com/NuGet/Home/issues/5894 -->
+  <Import Project="$(ArtifactsObjDir)$(AssemblyName)\*.props" Condition="'$(MSBuildProjectExtension)' == '.tmp_proj'" />
+
+  <PropertyGroup>
     <TargetFramework>net461</TargetFramework>
     <RootNamespace>Roslyn.SyntaxVisualizer.Control</RootNamespace>
     <AssemblyName>Roslyn.SyntaxVisualizer.Control</AssemblyName>
@@ -35,4 +38,7 @@
     </Page>
     <Resource Include="SyntaxGraph.ico" />
   </ItemGroup>
+
+  <!-- workaround for https://github.com/NuGet/Home/issues/5894 -->
+  <Import Project="$(ArtifactsObjDir)$(AssemblyName)\*.targets" Condition="'$(MSBuildProjectExtension)' == '.tmp_proj'" />
 </Project>

src/Tools/SyntaxVisualizer/Roslyn.SyntaxVisualizer.Extension/Roslyn.SyntaxVisualizer.Extension.csproj

@@ -1,4 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <!-- workaround for https://github.com/NuGet/Home/issues/5894 -->
+  <Import Project="$(ArtifactsObjDir)$(AssemblyName)\*.props" Condition="'$(MSBuildProjectExtension)' == '.tmp_proj'" />
+
   <PropertyGroup>
     <TargetFramework>net461</TargetFramework>
     <RootNamespace>Roslyn.SyntaxVisualizer.Extension</RootNamespace>
@@ -91,4 +94,7 @@
   <Target Name="Move_Assets" BeforeTargets="BeforeBuild">
     <Copy SourceFiles="@(FilesToMove)" DestinationFolder="$(ArtifactsObjDir)Roslyn.SyntaxVisualizer.Extension\net461\Roslyn.SyntaxVisualizer.Extension.xlf" />
   </Target>
+
+  <!-- workaround for https://github.com/NuGet/Home/issues/5894 -->
+  <Import Project="$(ArtifactsObjDir)$(AssemblyName)\*.targets" Condition="'$(MSBuildProjectExtension)' == '.tmp_proj'" />
 </Project>