[PATCH] Declare reallocarray by default

[Florian Weimer]

In <https://sourceware.org/ml/libc-alpha/2014-05/msg00506.html>, Joseph 
suggested to use __USE_GNU for this function, but since most of the BSDs 
and Illumos have it, I think __USE_MISC is more appropriate.  We have 
seen some reports of implicit function declarations, resulting in 
pointer truncation.  Declaring the function for _DEFAULT_SOURCE (i.e., 
by default, as long as -ansi isn't specified) would avoid such problems.

Thanks,
Florian
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