Please add strrstr

[Reuben Thomas]

Hi,

strrstr, which is to strstr as strrchr is to strchr, is a useful and 
moderately widely-used function. It's included in source form in quite a few 
programs. I have written an implementation that is part of a GNU program 
(GNU Zile). I'd be happy to see it in gnulib. Any chance of that? What do I 
need to do, if so?

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http://rrt.sc3d.org/ | impossible, a.  worth doing