Change gcc version check in test runner to a numeric comparison (GH-4359)
Change gcc version check in test runner to a numeric comparison (GH-4359)

The string comparison was reporting '11' < '4' (so OpenMP tests were being skipped on GCC 11)

cython/cython,scoder/cython,scoder/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython,da-woods/cython,cython/cython,da-woods/cython,scoder/cython,da-woods/cython