Added settings to ssnes-joyconfig.

tools/ssnes-joyconfig.c

@@ -92,6 +92,8 @@ static struct bind binds[] = {
    MISC_BIND("Movie recording toggle", movie_record_toggle)
    MISC_BIND("Pause", pause_toggle)
    MISC_BIND("Reset", reset)
+   MISC_BIND("Next shader", shader_next)
+   MISC_BIND("Previous shader", shader_prev)
 };
 
 static void get_binds(config_file_t *conf, int player, int joypad)