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SourceLink fails on macOS Mojave with "PlatformNotSupportedException: osx.10.14-x64"

See original GitHub issue

Repro

Create the sample in the README of this repo and dotnet build

Error

/Users/nmcmaster/.nuget/packages/microsoft.build.tasks.git/1.0.0-beta-63102-01/build/Microsoft.Build.Tasks.Git.targets(20,5): error MSB4018: The "Microsoft.Build.Tasks.Git.LocateRepository" task failed unexpectedly. [/Users/nmcmaster/dev/natemcmaster/dotnet-serve/src/dotnet-serve/dotnet-serve.csproj]
/Users/nmcmaster/.nuget/packages/microsoft.build.tasks.git/1.0.0-beta-63102-01/build/Microsoft.Build.Tasks.Git.targets(20,5): error MSB4018: System.TypeInitializationException: The type initializer for 'LibGit2Sharp.Core.NativeMethods' threw an exception. ---> System.PlatformNotSupportedException: osx.10.14-x64 [/Users/nmcmaster/dev/natemcmaster/dotnet-serve/src/dotnet-serve/dotnet-serve.csproj]
/Users/nmcmaster/.nuget/packages/microsoft.build.tasks.git/1.0.0-beta-63102-01/build/Microsoft.Build.Tasks.Git.targets(20,5): error MSB4018:    at Microsoft.Build.Tasks.Git.RuntimeIdMap.GetNativeLibraryDirectoryName() in /_/src/Microsoft.Build.Tasks.Git/RuntimeIdMap.cs:line 22 [/Users/nmcmaster/dev/natemcmaster/dotnet-serve/src/dotnet-serve/dotnet-serve.csproj]