[llvm-jitlink] Only use candidate library extensions during library search.

While processing library link options that check search paths (-lx, -hidden-lx,
etc.) we shouldn't generate candidate paths with extensions that are invalid
for the option being visited (e.g. -hidden-lx only applies to archives, so we
shouldn't generate candidates with `.so` extensions).

Note: Candidate extensions should probably be further filtered based on the OS
of the executing process. This patch is a step in the right direction though.

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