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Arcade 5.0.0-beta.20116.1 update broke mono/linker

See original GitHub issue

https://github.com/mono/linker/pull/954 update broke build with the following error

D:\a\1\s\.packages\microsoft.net.compilers.toolset\3.5.0-beta3-20110-03\tasks\netcoreapp3.1\Microsoft.Managed.Core.targets(104,5): error MSB4062: The "Microsoft.CodeAnalysis.BuildTasks.MapSourceRoots" task could not be loaded from the assembly D:\a\1\s\.packages\microsoft.net.compilers.toolset\3.5.0-beta3-20110-03\tasks\netcoreapp3.1\Microsoft.Build.Tasks.CodeAnalysis.dll. Could not load file or assembly 'System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask. [D:\a\1\s\external\cecil\Mono.Cecil.csproj]
2020-02-17T13:02:20.7290220Z ##[error].packages\microsoft.net.compilers.toolset\3.5.0-beta3-20110-03\tasks\netcoreapp3.1\Microsoft.Managed.Core.targets(104,5): error