[issue29172] blake2: Use lowest-common denominator signature of #pragma pack

[Irit Katriel]

Change by Irit Katriel <iritkatriel at gmail.com>:


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resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> BETA report: Python-3.6 build messages to stderr: AIX and "not GCC"

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29172>
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