TST: skip clongdouble alignment checks on 32 bit arches

turns out not only sparc is borked, skip the checks on all 32 bit arches
with too large clongdouble alignments until we have an aligned
allocator.
Merge pull request #5038 from juliantaylor/clongdouble-align

TST: skip clongdouble alignment checks on 32 bit arches