intf-add: do not list CLI if stdin is not a TTY (fix #4955)

(cherry picked from commit 8ac466488795c555fb32978509eb62df40ad57f0)

src/interface/interface.c

@@ -87,10 +87,12 @@ int intf_Create( vlc_object_t *p_this, const char *psz_module )
                 VLC_VAR_HASCHOICE | VLC_VAR_ISCOMMAND );
     text.psz_string = _("Add Interface");
     var_Change( p_intf, "intf-add", VLC_VAR_SETTEXT, &text, NULL );
-
-    val.psz_string = (char *)"rc";
-    text.psz_string = (char *)_("Console");
-    var_Change( p_intf, "intf-add", VLC_VAR_ADDCHOICE, &val, &text );
+    if( isatty( 0 ) )
+    {
+        val.psz_string = (char *)"rc";
+        text.psz_string = (char *)_("Console");
+        var_Change( p_intf, "intf-add", VLC_VAR_ADDCHOICE, &val, &text );
+    }
     val.psz_string = (char *)"telnet";
     text.psz_string = (char *)_("Telnet Interface");
     var_Change( p_intf, "intf-add", VLC_VAR_ADDCHOICE, &val, &text );