stdlib.h is universal too

stdlib.h is universal too

stdlib.h is universal as well, so there is no need to check for it.

2013-11-18  Tom Tromey  <tromey@redhat.com>

	* configure: Rebuild.
	* configure.ac: Don't check for stdlib.h
	* defs.h: Include stdlib.h unconditionally.

2013-11-18  Tom Tromey  <tromey@redhat.com>

	* configure: Rebuild.
	* configure.ac: Don't check for stdlib.h.
	* gdbreplay.c: Unconditionally include stdlib.h.