In all cases we now just set a single lib dirThere is a FIXME to add other directories to `LLVM_LIBRARY_DIRS`. If we don't do that, however, soit is the somewhat newer
ame as `LLVM_LIBRARY_DIR` variable is more appropriate. This is sort of a "plan B" revision in case we don't do that FIXME.
I still defined `LLVM_LIBRARY_DIRS` for sake of downstream projects, but
added a comment saying it was deprecated and should be removed. Is that
Also, I rearranged the definitions so they were more consistent.