Mono.Android.csproj is missing Configuration.Override.props import.

Author: atsushieno

src/Mono.Android/Mono.Android.csproj

@@ -10,6 +10,7 @@
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
   </PropertyGroup>
   <Import Project="..\..\Configuration.props" />
+  <Import Project="..\..\Configuration.Override.props" Condition="Exists('..\..\Configuration.Override.props')" />
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
@@ -310,4 +311,4 @@
       <ReferenceOutputAssembly>False</ReferenceOutputAssembly>
     </ProjectReference>
   </ItemGroup>
-</Project>
+</Project>