tools: vsh: Drop obsolete readline compatibility code

This code is needed to use readline older than 4.1, but all
our target platforms ship with at least 6.0 these days so we
can safely get rid of it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

tools/vsh.c

@@ -2945,32 +2945,15 @@ vshReadlineInit(vshControl *ctl)
     /* Opaque data for autocomplete callbacks. */
     autoCompleteOpaque = ctl;
 
-    /* Allow conditional parsing of the ~/.inputrc file.
-     * Work around ancient readline 4.1 (hello Mac OS X),
-     * which declared it as 'char *' instead of 'const char *'.
-     */
-# if defined(RL_READLINE_VERSION) && RL_READLINE_VERSION > 0x0402
     rl_readline_name = ctl->name;
-# else
-    rl_readline_name = (char *) ctl->name;
-# endif
 
     /* Tell the completer that we want a crack first. */
     rl_attempted_completion_function = vshReadlineCompletion;
 
-# if defined(RL_READLINE_VERSION) && RL_READLINE_VERSION > 0x0402
     rl_basic_word_break_characters = break_characters;
-# else
-    rl_basic_word_break_characters = (char *) break_characters;
-# endif
 
-# if defined(RL_READLINE_VERSION) && RL_READLINE_VERSION > 0x0402
     rl_completer_quote_characters = quote_characters;
     rl_char_is_quoted_p = vshReadlineCharIsQuoted;
-# else
-    rl_completer_quote_characters = (char *) quote_characters;
-    rl_char_is_quoted_p = (Function *) vshReadlineCharIsQuoted;
-# endif
 
     if (virAsprintf(&histsize_env, "%s_HISTSIZE", ctl->env_prefix) < 0)
         goto cleanup;