H5Z_FLAG_OTPTIONAL compliant behavior when lz4 compressoin enabled#111

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hernot wants to merge 3 commits intokiyo-masui:masterfrom

hernot:h5z-flt-opt-lz4

Commits on Mar 22, 2022

Commits on Mar 23, 2022

Disabled ASM support for zstd and fixed rebase error in test_h5 filter.py
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