Replace the malloc.h header with stdlib.h.

--- src/syndrum.cpp.orig	Mon Nov  3 22:54:13 2014
+++ src/syndrum.cpp	Mon Nov  3 22:56:33 2014
@@ -24,7 +24,7 @@
 
 /*****************************************************************************/
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <math.h>
 #include "cmt.h"