Replace the malloc.h header with stdlib.h.

--- src/vcf303.cpp.orig	Mon Nov  3 22:57:04 2014
+++ src/vcf303.cpp	Mon Nov  3 22:57:15 2014
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <math.h>
 #include "cmt.h"