default md5.h to define function prototypes #316

Job	Run time
Build wheels (linux-manylinux_2_28)	12m 33s
Build wheels (macos-x86_64)	27m 22s
Build wheels (linux-manylinux2014)	9m 2s
Build wheels (macos-arm64)	13m 31s
Create release	0s
	1h 2m 28s

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