[PATCH] add memrchr(3)

[Yaakov (Cygwin/X)]

This patch adds memrchr(3), a GNU extension also found in the BSDs:

http://man7.org/linux/man-pages/man3/memrchr.3.html

This patch is based on strrchr's usage of strchr.

Patch and new file attached.


Yaakov
Cygwin/X

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