cnxcc: incude stdlib.h to get rid of compile warnings for malloc/free

(cherry picked from commit 8a8ed04d2bbd0547a08eeec328268cd171cc9419)

modules/cnxcc/cnxcc_check.c

@@ -23,6 +23,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "cnxcc_mod.h"
 #include "cnxcc.h"