Merge branch 'jk/really-deprecate-pack-redundant'

"git pack-redundant" gave a warning when run, as the command has
outlived its usefulness long ago and is nominated for future
removal.  Now we escalate to give an error.

* jk/really-deprecate-pack-redundant:
  pack-redundant: escalate deprecation warning to an error

builtin/pack-redundant.c

@@ -604,6 +604,7 @@ int cmd_pack_redundant(int argc, const char **argv, const char *prefix)
 			"option, '--i-still-use-this', on the command line\n"
 			"and let us know you still use it by sending an e-mail\n"
 			"to <[email protected]>.  Thanks.\n"), stderr);
+		die(_("refusing to run without --i-still-use-this"));
 	}
 
 	if (load_all_packs)