dtterm: Change to ANSI function definitions

cde/programs/dtterm/DtTermMain.c

@@ -837,7 +837,7 @@ CreateInstance
 }
 
 void
-AtExitProc()
+AtExitProc(void)
 {
     static int i = 0;
 

cde/programs/dtterm/DtTermSyntax.c

@@ -90,7 +90,7 @@ static char *message_defaults[] = {
 "End-Of-List",
 };
 
-static void GetUsage()
+static void GetUsage(void)
 {
     register struct _options *optPtr;
     register int i;

cde/programs/dtterm/sunDtTermServer.c

@@ -87,7 +87,7 @@ static void TimeOut(XtPointer clientData, XtIntervalId *id);
 #endif  /* TIMEOUT */
 
 Boolean
-FinalizeToolTalkSession( )
+FinalizeToolTalkSession(void)
 {
     Tt_status 	ttRc;
     int 	i;