[msbuild/dotnet] Handle dylibs that don't start with 'lib' better. Fixes #15044.

[rolfbjarne]

For a given dylib named '/path/to/libMyLibrary.dylib', we pass this to the native linker:

-L/path/to -lMyLibrary

however, that doesn't work unless the dylib's name starts with 'lib'.

So detect this, and if the dylib doesn't start with 'lib' (say it's just
'MyLibrary.dylib'), then just pass the path to the dylib as-is to the native
linker:

/path/to/MyLibrary.dylib

Fixes #15044.

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• xamarin.ios-16.5.0.297.pkg
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✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

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