* hashtab.c, partition.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.

	* sort.c: Bring over from GCC.

libiberty/xmemdup.c

@@ -9,6 +9,9 @@
 #include "libiberty.h"
 
 #include <sys/types.h> /* For size_t. */
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 
 PTR
 xmemdup (input, copy_size, alloc_size)