add --dumpmongen to view mongen_order[] array

sys/unix/unixmain.c

@@ -659,6 +659,9 @@ early_options(int *argc_p, char ***argv_p, char **hackdir_p)
                 opt_terminate();
                 /*NOTREACHED*/
 #endif
+            } else if (argcheck(argc, argv, ARG_DUMPMONGEN) == 2) {
+                opt_terminate();
+                /*NOTREACHED*/
             } else {
 #ifdef CHDIR
                 oldargc = argc;

sys/windows/windmain.c

@@ -484,6 +484,9 @@ early_options(int argc, char *argv[])
         }
 #endif
 #endif
+        if (argcheck(argc, argv, ARG_DUMPMONGEN) == 2) {
+            nethack_exit(EXIT_SUCCESS);
+        }
         if (argcheck(argc, argv, ARG_DEBUG) == 1) {
             argc--;
             argv++;