Update the change to add gomp compatibity to llvm-openmp. (#17400)

* Update the change to add gomp compatibity to llvm-openmp.

* Update the change to add gomp compatibity to llvm-openmp using append instead of extend.

* Fix flake8 issue.

Co-authored-by: Jim Galarowicz <jgalarowicz@newmexicoconsortium.org>