[msbuild] Add a GetMinimumOSVersion target that reads the app manifest and outputs the MinimumOSVersion. #8858
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This makes it possible for several other tasks to take the MinimumOSVersion as
direct input, instead of the app manifest's path. Previously the app manifest
(Info.plist) was loaded and parsed in each task, slightly differently in each
place, and in addition there are differences between macOS and other
platforms, which made it even worse. This code refactoring also made it
possible to remove an error code which wasn't necessary anymore.
This task also computes the default MinimumOSVersion if none is specified in
the app manifest.
There is one breaking change: a library project could previously specify an
inexistent Info.plist, and it would build fine. This will now result in a
"Error loading 'Info.plist': File not found" error. This is trivial to fix:
just remove the Info.plist from the project file (or an alternative solution
could be to condition the inclusion of the Info.plist in the project file on
the existence of the Info.plist).
New commits in xamarin/Xamarin.MacDev:
Diff: https://github.com/xamarin/Xamarin.MacDev/compare/45c5a680e20a209ac846a32e0f2f0f83e843ab76..a1bc6f39b3efe5d817c60d78eaff3f4c2de720ea