Include stdlib.h for the abs() function.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

--- zbedic-1.2.orig/src/settings.cpp
+++ zbedic-1.2/src/settings.cpp
@@ -23,6 +23,7 @@
 ****************************************************************************/
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include <qlabel.h>
 #include <qhbox.h>