build: resolve compile error under gcc-14

xcmds.c: In function "FunChangeList":
xcmds.c:715:36: error: passing argument 2 of "XawListChange" from
incompatible pointer type [-Wincompatible-pointer-types]
  715 |     XawListChange( arg->sel->list, (const char **)text, 0, 0, True );

src.x11/xcmds.c

@@ -712,7 +712,7 @@ static Boolean FunChangeList (
     text[i] = 0;
 
     /* change list */
-    XawListChange( arg->sel->list, (const char **)text, 0, 0, True );
+    XawListChange( arg->sel->list, (String *)text, 0, 0, True );
 
     /* clear old text */
     for ( i = 0;  arg->sel->text[i];  i++ )