[ccan] Annoying warning, a.k.a. how to add to CFLAGS

[Rhys Ulerich]

ccan/strgrp/strgrp.c: In function ‘grp_for’:
ccan/strgrp/strgrp.c:296:0: warning: ignoring #pragma omp parallel
[-Wunknown-pragmas]
     #pragma omp parallel for schedule(dynamic)


An ifdef might be added to the code:
https://stackoverflow.com/questions/1300180/ignore-openmp-on-machine-that-doesnt-have-it

- Rhys
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