Handle cascading of different (static) librarian on Windows #5719
Description
Description
Windows needs to support cascading of libraians. If the user requests it (via the command line or the settings plist), lld-link should be used, otherwise, we should default to link. If the user specifies AR=llvm-ar we should instead use llvm-ar. This would also require changing the command line format for the librarian.
Expected behavior
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Actual behavior
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Steps to reproduce
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Swift Package Manager version/commit hash
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Swift & OS version (output of swift --version && uname -a)
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