[Toybox] [PATCH] md5sum: fix libcrypto build.

[enh]

OpenSSL uses the bare names like `MD5` itself. We could add a lot
more #ifdefs instead, but it seems easier to just rename the toybox
constants. I did check, and thanks to -ffunction-sections and
-fdata-sections none of the built-in hash implementations end up in a
libcrypto-using toybox, so it doesn't seem like there would be any other
advantage to more #ifdefs.
---
 toys/lsb/md5sum.c | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)
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