Restore assemblies removed from vsix

System.Composition.Convention|Hosting|TypedParts
System.Collections.Immutable
System.Reflection.Metadata

Only restored to Roslyn.VisualStudio.Setup.vsix

src/VisualStudio/Setup/VisualStudioSetup.csproj

@@ -189,22 +189,32 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
       <Private>True</Private>
+      <!-- Included in the VSIX because it makes our setup authoring (DevDivInsertionFiles) easier. -->
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </Reference>
     <Reference Include="System.Reflection.Metadata">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\System.Reflection.Metadata.$(SystemReflectionMetadataVersion)\lib\portable-net45+win8\System.Reflection.Metadata.dll</HintPath>
+      <!-- Included in the VSIX because it makes our setup authoring (DevDivInsertionFiles) easier. -->
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </Reference>
     <Reference Include="System.Composition.Convention">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\Microsoft.Composition.$(MicrosoftCompositionVersion)\lib\portable-net45+win8+wp8+wpa81\System.Composition.Convention.dll</HintPath>
+      <!-- Included in the VSIX because it makes our setup authoring (DevDivInsertionFiles) easier. -->
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </Reference>
     <Reference Include="System.Composition.Hosting">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\Microsoft.Composition.$(MicrosoftCompositionVersion)\lib\portable-net45+win8+wp8+wpa81\System.Composition.Hosting.dll</HintPath>
+      <!-- Included in the VSIX because it makes our setup authoring (DevDivInsertionFiles) easier. -->
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </Reference>
     <Reference Include="System.Composition.TypedParts">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\Microsoft.Composition.$(MicrosoftCompositionVersion)\lib\portable-net45+win8+wp8+wpa81\System.Composition.TypedParts.dll</HintPath>
+      <!-- Included in the VSIX because it makes our setup authoring (DevDivInsertionFiles) easier. -->
+      <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </Reference>
   </ItemGroup>
   <ItemGroup>