Move stdlib.h to common-defs.h

Move stdlib.h to common-defs.h

This commit moves the inclusion of stdlib.h to common-defs.h and
removes all other inclusions.

gdb/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* common/common-defs.h: Include stdlib.h.
	* defs.h: Do not include stdlib.h.
	* addrmap.c: Likewise.
	* bcache.c: Likewise.
	* common/buffer.c: Likewise.
	* common/common-utils.c: Likewise.
	* cp-name-parser.y: Likewise.
	* go32-nat.c: Likewise.
	* mn10300-linux-tdep.c: Likewise.
	* nat/linux-osdata.c: Likewise.
	* tui/tui.c: Likewise.
	* windows-nat.c: Likewise.

gdb/gdbserver/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* server.h: Do not include stdlib.h.
	* inferiors.c: Likewise.
	* linux-low.c: Likewise.
	* regcache.c: Likewise.
	* spu-low.c: Likewise.
	* tracepoint.c: Likewise.
	* utils.c: Likewise.