Cannot find FSharp.Core or one of its dependencies during testing

[luhenry]

Xamarin.Android.Build.Tests.AndroidUpdateResourcesTest.CheckResourceDesignerIsCreated.Xamarin.Android.Build.Tests.AndroidUpdateResourcesTest.CheckResourceDesignerIsCreated is failing for the mono:2018-02 integration

Error:

/Users/builder/jenkins/workspace/xamarin-android-pr-builder/xamarin-android/bin/Debug/lib/xamarin.android/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: error : Error executing task GenerateResourceDesigner: Could not load file or assembly 'FSharp.Core, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
Error executing task GenerateResourceDesigner: System.IO.FileNotFoundException: Could not load file or assembly 'FSharp.Core, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
File name: 'FSharp.Core, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
  at System.CodeDom.Compiler.CodeDomProvider.CreateGenerator (System.IO.TextWriter output) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.CodeDom/src/System/CodeDom/Compiler/CodeDomProvider.cs:123 
  at Xamarin.Android.Tasks.GenerateResourceDesigner.WriteFile (System.String file, System.CodeDom.CodeTypeDeclaration resources, System.String language, System.Boolean isFSharp, System.Boolean isCSharp) [0x0012a] in /Users/builder/jenkins/workspace/xamarin-android-pr-builder/xamarin-android/src/Xamarin.Android.Build.Tasks/Tasks/GenerateResourceDesigner.cs:217 
  at Xamarin.Android.Tasks.GenerateResourceDesigner.Execute () [0x0065b] in /Users/builder/jenkins/workspace/xamarin-android-pr-builder/xamarin-android/src/Xamarin.Android.Build.Tasks/Tasks/GenerateResourceDesigner.cs:155 
  at Microsoft.Build.BuildEngine.TaskEngine.Execute () [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/TaskEngine.cs:134 
  at Microsoft.Build.BuildEngine.BuildTask.Execute () [0x0008d] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/BuildTask.cs:101 

Logs:

https://jenkins.mono-project.com/job/xamarin-android-pr-builder/2618/testReport/junit/Xamarin.Android.Build.Tests.AndroidUpdateResourcesTest/CheckResourceDesignerIsCreated/Xamarin_Android_Build_Tests_AndroidUpdateResourcesTest_CheckResourceDesignerIsCreated_False_FSharp____Debug/
https://jenkins.mono-project.com/job/xamarin-android-pr-builder/2618/testReport/junit/Xamarin.Android.Build.Tests.AndroidUpdateResourcesTest/CheckResourceDesignerIsCreated/Xamarin_Android_Build_Tests_AndroidUpdateResourcesTest_CheckResourceDesignerIsCreated_True_FSharp____Debug/

Issue (as figured out by @jonpryor at mono/mono#7511 (comment)):

The current code should be using the FSharp.Compiler.CodeDom NuGet package, which has a reference on FSharp.Core.dll v4.3.1.0.

Fixes mono/mono#7511

mono/mono#6842 #1289