[openmp] Fix bug63197.c test with 3 cores (#183269) This test assumes that the number of available threads is not 3, otherwise `#pragma omp parallel` and `#pragma omp parallel num_thread(3)` are naturally going to do the same thing. Instead use `omp_get_max_threads() - 1` as the number of threads in the initial `omp parallel num_thread(N)` and then check that the number of threads does not match the value in the later `omp parallel`. (cherry picked from commit 368b884869651b69b14b836b25206aa62b501496)
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