[MRG] Reverting openmp compilation flags for macOS (#797)

* Reverting openmp compilation flags

* Reverting openmp compilation flags (ruff-format)

* Wring PR number

* Typo in new test

* Removing tes_ot_openmp (already tested in test_ot)

Author: dcoeurjo

RELEASES.md

@@ -24,6 +24,7 @@ This new release adds support for sparse cost matrices and a new lazy EMD solver
 - Clean documentation (PR #787)
 - Fix code coverage (PR #791)
 - Fix test of the version of jax in `ot.backend` (PR #794)
+- Reverting the openmp fix on macOS (PR #789) for macOS (PR #797)
 
 
 ## 0.9.6.post1

ot/helpers/openmp_helpers.py

@@ -34,16 +34,13 @@ def get_openmp_flag(compiler):
         omp_flag = ["-fopenmp"]
         if sys.platform.startswith("darwin"):
             omp_flag = ["-Xpreprocessor", "-fopenmp"]
-            omp_flag += ["-I/usr/local/opt/libomp/include"]
             #  Assuming `brew install libomp` on recent macOS
             if os.path.isfile("/opt/homebrew/opt/libomp/lib/libomp.dylib"):
                 omp_flag += ["-I/opt/homebrew/opt/libomp/include"]
-                omp_flag += ["/opt/homebrew/opt/libomp/lib/libomp.dylib"]
             else:
                 # Assuming `brew install libomp` on old macOS
                 if os.path.isfile("/usr/local/opt/libomp/lib/libomp.dylib"):
                     omp_flag += ["-I/usr/local/opt/libomp/include"]
-                    omp_flag += ["/usr/local/opt/libomp/lib/libomp.dylib"]
 
     return omp_flag