Add references to Microsoft.VisualStudio.Utilities

If we don't have this, CreatePkgDef is getting angry. My guess is the
assembly is no longer in the GAC, and so it's being implicitly relied on
that the assembly is copied by MSBuild for CreatePkgDef to find it.

src/Compilers/Extension/CompilerExtension.csproj

@@ -89,6 +89,7 @@
     <Reference Include="Microsoft.VisualStudio.Shell.Immutable.12.0">
       <Private>false</Private>
     </Reference>
+    <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioReferenceAssemblyVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Data" />

src/InteractiveWindow/VisualStudio/VisualStudioInteractiveWindow.csproj

@@ -108,6 +108,7 @@
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop.8.0, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <Private>false</Private>
     </Reference>
+    <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioReferenceAssemblyVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />

src/VisualStudio/CSharp/Repl/CSharpVisualStudioRepl.csproj

@@ -127,6 +127,7 @@
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop.8.0, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <Private>false</Private>
     </Reference>
+    <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioReferenceAssemblyVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />

src/VisualStudio/VisualBasic/Repl/BasicVisualStudioRepl.vbproj

@@ -124,6 +124,7 @@
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop.8.0, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <Private>false</Private>
     </Reference>
+    <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioReferenceAssemblyVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />

src/VisualStudio/VisualStudioDiagnosticsToolWindow/VisualStudioDiagnosticsWindow.csproj

@@ -119,6 +119,7 @@
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop"><Private>false</Private></Reference>
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop.10.0, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"><Private>false</Private></Reference>
     <Reference Include="Microsoft.VisualStudio.TextManager.Interop.8.0, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"><Private>false</Private></Reference>
+    <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioReferenceAssemblyVersion), Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />