default md5.h to define function prototypes #315

Job	Run time
Build wheels (macos-arm64)	14m 46s
Build wheels (linux-manylinux2014)	8m 51s
Build wheels (linux-manylinux_2_28)	13m 4s
Build wheels (macos-x86_64)	28m 23s
Create release	0s
	1h 5m 4s

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