./build.sh runs the Core PowerShell TypeCatalogGen.exe under Mono
on Linux (using dotnet-cli). The Runtime folder is a facade
project that, when published, produces a list of the currently used
runtime assemblies for .NET Core. The output is
CorePsTypeCatalog.cs, which contains an "initialized" dictionary
that we copy into typecatalog.cs of System.Management.Automation
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