[Issue 21560] md5 poor performance out of the box

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21560

--- Comment #3 from Witold Baryluk <witold.baryluk+d at gmail.com> ---
also openssl 1.1.1i-2 from Debian testing (uses 8kiB buffers):

MD5(/usr/lib/live/mount/overlay/rw/var/lib/docker/devicemapper/devicemapper/data)=
009f07e9b8fb09a820dd180441502d46
real    2m18.517s

Similar to md5sum (coreutils 8.32).

Both faster than phobos.

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