Switching System.Dynamic.Runtime to use sources from /Open

[tfs-changeset: 1493918]

Author: VSadov

src/System.Dynamic.Runtime/src/System.Dynamic.Runtime.csproj

@@ -123,8 +123,5 @@
 
     <None Include="project.json" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(IsInterpreting)' == 'true' ">
-    <None Include="projectInterpreting.json" />
-  </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
 </Project>