Add Microsoft.CodeAnalysis.Workspaces.MSBuild.dll to our setup deploy

Although taking a dependency on this in Visual Studio isn't recommended,
not including this means any extension who do will end up with a
smorgasboard of versions that they are trying to deploy, which will
probably conflict with the versions that we are deploying and everything
would explode.

src/VisualStudio/Setup/AssemblyRedirects.cs

@@ -18,6 +18,7 @@
 [assembly: ProvideRoslynBindingRedirection("Microsoft.CodeAnalysis.VisualBasic.Workspaces.dll")]
 [assembly: ProvideRoslynBindingRedirection("Microsoft.CodeAnalysis.Workspaces.Desktop.dll")]
 [assembly: ProvideRoslynBindingRedirection("Microsoft.CodeAnalysis.Workspaces.dll")]
+[assembly: ProvideRoslynBindingRedirection("Microsoft.CodeAnalysis.Workspaces.MSBuild.dll")]
 [assembly: ProvideRoslynBindingRedirection("Microsoft.VisualStudio.LanguageServices.dll")]
 [assembly: ProvideRoslynBindingRedirection("Microsoft.VisualStudio.LanguageServices.Implementation.dll")]
 [assembly: ProvideRoslynBindingRedirection("Microsoft.VisualStudio.LanguageServices.VisualBasic.dll")]

src/VisualStudio/Setup/VisualStudioSetup.csproj

@@ -128,6 +128,14 @@
       <NgenArchitecture>All</NgenArchitecture>
       <NgenPriority>3</NgenPriority>
     </ProjectReference>
+    <ProjectReference Include="..\..\Workspaces\Core\MSBuild\Workspaces.MSBuild.csproj">
+      <Name>Workspaces.MSBuild</Name>
+      <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup</IncludeOutputGroupsInVSIX>
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
+      <Ngen>true</Ngen>
+      <NgenArchitecture>All</NgenArchitecture>
+      <NgenPriority>3</NgenPriority>
+    </ProjectReference>
     <ProjectReference Include="..\..\Workspaces\CSharp\Portable\CSharpWorkspace.csproj">
       <Name>CSharpWorkspace</Name>
       <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup</IncludeOutputGroupsInVSIX>