Fix compiler/linker interface assumptions for swiftc #14314
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Split out from #14261, needed to make Swift compilation use the generic C/... code path.
Not all compilers (swiftc in this case) concatenate linker arguments with ','. This removes that assumption and instead always passes the arguments in a list where applicable.
Some Apple ld arguments, notably -install_name, are also not exposed directly on the compiler options interface, hence add the linker prefix here.