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BUG: Fix various Big-Endian test failures (ppc64) #10561
Backport of #10433.
This fixes a few miscellaneous test failures on ppc64 (big endian). They're all problems with the test, not numpy.
There is an additional heisenbug which I haven't been able to track down since it only occurs rarely, randomly: The test test_require_each occasionally fails to set the "align" flag on a complex128 array. May be related to #6377.
After these fixes, the only remaining ppc64 test failures are for float128 types (fixed on my local copy, to submit soon), and #10442.