[Bug string/16004] memcpy/strcpy: detect memory overlap and crash when error is detected

[slyfox at inbox dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=16004

--- Comment #4 from Sergei Trofimovich <slyfox at inbox dot ru> ---
A while ago OpenBSD added simple overlap check to memcpy():

http://marc.info/?l=openbsd-ports&m=141666286130523&w=2

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