* hashtab.c, partition.c, sort.c, xmemdup.c: Include string.h
if HAVE_STRING_H.
* pexecute.c, xexit.c: Include stdlib.h if HAVE_STDLIB_H.
* objalloc.c: Include config.h. Include stdlib.h and don't
declare malloc or free if HAVE_STDLIB_H.
* strerror.c, strsignal.c: Include stdlib.h if HAVE_STDLIB_H,
else declare malloc without prototype. Include string.h if
HAVE_STRING_H, else declare memset without prototype. Don't
include stddef.h.
From-SVN: r34254
