Only include MetricsService in internal builds.

Author: Steven Kirk

src/GitHub.Exports/GitHub.Exports.csproj

@@ -91,7 +91,7 @@
     <None Include="..\common\settings.json">
       <Link>Properties\settings.json</Link>
     </None>
-    <Compile Include="..\..\script\src\MetricsService.cs">
+    <Compile Include="..\..\script\src\MetricsService.cs" Condition="$(Buildtype) == 'Internal'">
       <Link>Services\MetricsService.cs</Link>
     </Compile>
     <Compile Include="Collections\ICopyable.cs" />