Adjust omp-low test for alignment

[Richard Henderson]

The m68k-linux failure for the various omp atomic tests
is due to the fact that BIGGEST_ALIGNMENT is 16 bits on
that platform.  I think it's pretty reasonable to assume
that if something is aligned to BIGGEST_ALIGNEMENT, then
it can be considered "aligned".

Tested on x86_64-linux and m68k-linux cross.


r~
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