Remove UseRoslynPathHack for Android projects

src/Android/Avalonia.Android/Avalonia.Android.csproj

@@ -133,7 +133,4 @@
   <Import Project="..\..\Shared\PlatformSupport\PlatformSupport.projitems" Label="Shared" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
   <Import Project="..\..\..\build\Rx.props" />
-  <PropertyGroup Condition="'$(UseRoslynPathHack)' == ''">
-    <CscToolPath>$(MSBuildToolsPath)\Roslyn</CscToolPath>
-  </PropertyGroup>
 </Project>

src/Skia/Avalonia.Skia.Android/Avalonia.Skia.Android.csproj

@@ -86,7 +86,4 @@
   <Import Project="..\..\Shared\RenderHelpers\RenderHelpers.projitems" Label="Shared" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
   <Import Project="..\..\..\build\SkiaSharp.props" />
-  <PropertyGroup Condition="'$(UseRoslynPathHack)' == ''">
-    <CscToolPath>$(MSBuildToolsPath)\Roslyn</CscToolPath>
-  </PropertyGroup>
 </Project>