default value for BASH_LOADABLES_PATH; other minor changes

lib/readline/funmap.c

@@ -199,6 +199,7 @@ static const FUNMAP default_funmap[] = {
   { "vi-set-mark", rl_vi_set_mark },
   { "vi-subst", rl_vi_subst },
   { "vi-tilde-expand", rl_vi_tilde_expand },
+  { "vi-undo", rl_vi_undo },
   { "vi-unix-word-rubout", rl_vi_unix_word_rubout },
   { "vi-yank-arg", rl_vi_yank_arg },
   { "vi-yank-pop", rl_vi_yank_pop },