Revert "work around LLVM 10 llvm-config giving absolute path to libz.so"

This reverts commit 73256dda91d0d5b3d13016d15f2c4465a69cd7d4.

No longer needed with latest release/10.x branch.
3418a332abAndrew Kelley committed on 3/3/2020, 2:17:37 PMparente4180de
1 file changedLine totals unavailable