Fix win32/s390x for PR4641#6
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wiredfool merged 3 commits intowiredfool:4641_rebasefrom Jan 10, 2021
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Fixes stack corruption in python-pillow#5178
TIFFTAG_PLANARCONFIGis auint16value, reading it intoUINT8corrupts thestatepointer (on win32). Big-endian was most likely the same issue.Also change
memset(unpackers, 0, sizeof(ImagingShuffler *) * 4);tomemset(unpackers, 0, sizeof(ImagingShuffler) * 4);since it seems to be a typo (ImagingShuffleris already a pointer).