Fix to different compile warnings.

Fix to multiple int-conversion
Removal of duplicated function definition in dtudcfonted/util.h
Added XtEventHandler prototypes to mtfgui

cde/programs/dtksh/findsym.c

@@ -99,5 +99,5 @@ fsym(
 #endif
 #endif
 
-   return(NULL);
+   return(0);
 }