add stdlib.h to fix compile issues with msvc

Modified: trunk/reactos/subsys/system/calc/winecalc.c

--- trunk/reactos/subsys/system/calc/winecalc.c	2005-10-18 17:07:45 UTC (rev 18554)
+++ trunk/reactos/subsys/system/calc/winecalc.c	2005-10-18 19:48:50 UTC (rev 18555)
@@ -20,6 +20,7 @@

 
 #include <stdio.h> // sprintf
 #include <math.h>

+#include <stdlib.h>

 
 #include <windows.h>
 #include <tchar.h>