[Chapel Merge] Skip test for clang to workaround missing omp.h

Branch: refs/heads/master
Revision: 921c25b
Author: mppf
Log Message:

Merge pull request #17867 from mppf/skipif-taskspawn

Skip test for clang to workaround missing omp.h

We were seeing failure to find omp.h when compiling empty-omp-taskspawn with the clang we built to support CHPL_LLVM=system. Since this is an issue with that clang build, this PR just skips the test in that configuration.

Modified Files:
M test/parallel/taskCompare/elliot/empty-omp-taskspawn.skipif

Compare: https://github.com/chapel-lang/chapel/compare/1acb0906c7e4...921c25b98a84