Restore UseRoslynPathHack

build.cake

@@ -143,6 +143,7 @@ Task("Build")
         MSBuild(parameters.MSBuildSolution, settings => {
             settings.SetConfiguration(parameters.Configuration);
             settings.WithProperty("Platform", "\"" + parameters.Platform + "\"");
+            settings.WithProperty("UseRoslynPathHack", "true");
             settings.SetVerbosity(Verbosity.Minimal);
             settings.WithProperty("Windows", "True");
             settings.UseToolVersion(MSBuildToolVersion.VS2017);

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

@@ -86,4 +86,7 @@
   <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>

src/Skia/Avalonia.Skia.iOS/Avalonia.Skia.iOS.csproj

@@ -88,4 +88,7 @@
   <Import Project="..\..\Shared\RenderHelpers\RenderHelpers.projitems" Label="Shared" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
   <Import Project="..\..\..\build\SkiaSharp.props" />
+  <PropertyGroup Condition="'$(UseRoslynPathHack)' == ''">
+    <CscToolPath>$(MSBuildToolsPath)\Roslyn</CscToolPath>
+  </PropertyGroup>
 </Project>

src/iOS/Avalonia.iOS/Avalonia.iOS.csproj

@@ -105,4 +105,7 @@
   <Import Project="..\..\Shared\PlatformSupport\PlatformSupport.projitems" Label="Shared" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
   <Import Project="..\..\..\build\Rx.props" />
+  <PropertyGroup Condition="'$(UseRoslynPathHack)' == ''">
+    <CscToolPath>$(MSBuildToolsPath)\Roslyn</CscToolPath>
+  </PropertyGroup>
 </Project>