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/dtkcmds.c

@@ -7065,14 +7065,14 @@ static struct named_integer CallbackReasons[] = {
 	{ "CR_TEAR_OFF_DEACTIVATE",	XmCR_TEAR_OFF_DEACTIVATE },
 	{ "CR_OBSCURED_TRAVERSAL",	XmCR_OBSCURED_TRAVERSAL },
 	{ "CR_PROTOCOLS",	6666 },
-	{ NULL,				NULL },
+	{ NULL,				0 },
 };
 
 
 static struct named_integer HelpCallbackReasons[] = {
 	{ "HELP_CR_CLOSE",		DtCR_HELP_CLOSE },
 	{ "HELP_CR_LINK_ACTIVATE",	DtCR_HELP_LINK_ACTIVATE },
-	{ NULL,				NULL },
+	{ NULL,				0 },
 };
 
 

cde/programs/dtksh/findsym.c

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

cde/programs/dtksh/xmcvt.c

@@ -1272,7 +1272,7 @@ static ModifierState modifierTable[] = {
    {"Mod4Mask",    Mod4Mask},
    {"Mod5Mask",    Mod5Mask},
    {"ShiftMask",   ShiftMask},
-   {NULL,          NULL},
+   {NULL,          0},
 };