Build ego.

--HG--
branch : dtrg-buildsystem
rename : util/arch/build.mk => util/ego/build.mk

util/ego/cs/cs_alloc.c

@@ -3,6 +3,7 @@
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
  */
+#include <stdlib.h>
 #include "../share/types.h"
 #include "../share/alloc.h"
 #include "cs.h"