Revert "Unskip Mold test"

This reverts commit 87e82a7.

Author: mati865

wild/tests/external_tests/mold_skip_tests.toml

@@ -77,6 +77,7 @@ tests = [
   "z-dynamic-undefined-weak.sh",
   "z-nodefaultlib.sh",
   "z-nodump.sh",
+  "z-pack-relative-relocs.sh",
   "z-rodynamic.sh",
   "z-sectionheader.sh",
   "z-start-stop-visibility.sh",