Exclude XmlUtil.cs to match project.json exclude

Author: bording

projects/client/RabbitMQ.Client/RabbitMQ.Client.xproj

@@ -11,9 +11,11 @@
     <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
     <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
   </PropertyGroup>
-
   <PropertyGroup>
     <SchemaVersion>2.0</SchemaVersion>
   </PropertyGroup>
+  <ItemGroup>
+    <DnxInvisibleCompile Include="src\util\XmlUtil.cs" />
+  </ItemGroup>
   <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
 </Project>