Commit 3383f0d repointed LIBOMPTARGET_LIBRARY_DIR to a different
runtimes lib dir, but the unit lit config still derived the unittest
binary path from it. Pass the unittest directory explicitly instead.
Commit 3383f0d repointed LIBOMPTARGET_LIBRARY_DIR to a different
runtimes lib dir, but the unit lit config still derived the unittest
binary path from it. Pass the unittest directory explicitly instead.