[linker] add new source files to project file

Author: lewurm

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj

@@ -292,6 +292,12 @@
     <Compile Include="$(LinkerSourceFullPath)\linker\Mono.Linker\Pipeline.cs">
       <Link>Linker\Mono.Linker\Pipeline.cs</Link>
     </Compile>
+    <Compile Include="$(LinkerSourceFullPath)\linker\Mono.Linker\MethodReferenceExtensions.cs">
+      <Link>Linker\Mono.Linker\MethodReferenceExtensions.cs</Link>
+    </Compile>
+    <Compile Include="$(LinkerSourceFullPath)\linker\Mono.Linker\TypeReferenceExtensions.cs">
+      <Link>Linker\Mono.Linker\TypeReferenceExtensions.cs</Link>
+    </Compile>
     <Compile Include="$(LinkerSourceFullPath)\linker\Mono.Linker\TypePreserve.cs">
       <Link>Linker\Mono.Linker\TypePreserve.cs</Link>
     </Compile>