DragonFlyBSD/src 64c3fdbinclude stdlib.h, lib/libc/stdlib recallocarray.c reallocarray.3

libc/stdlib: Add recallocarray() function.

It is useful function for security related features, like resizing
memory objects containing sensitive data to avoid information leaking.
Update manpage.

Taken-from: OpenBSD
DeltaFile
+80-0lib/libc/stdlib/recallocarray.c
+23-7lib/libc/stdlib/reallocarray.3
+2-1lib/libc/stdlib/Makefile.inc
+2-0include/stdlib.h
+1-0lib/libc/stdlib/Symbol.map
+108-85 files

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