[Patch] OpenMP: Add 'omp requires' to Fortran (mostly parsing)

[Tobias Burnus]

I just realized that supporting 'acq_rel' is simple; while
'omp atomic' parsing needs to be updated quite a bit for the
OpenMP 5 changes, just adding ACQ_REL support for 'requires'
is trivial.

Hence, I updated the requires-9.c testcase for 'acq_rel',
adjusted trans-openmp.c and did some openmp.c adjustments.

Thus: New version with this trivial change and being
able to tick-off the 'atomic_default_mem_order' clause :-)

Tobias

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