Silence unused variable warnings

gfx/video_driver.c

@@ -152,6 +152,8 @@ void find_video_driver(void)
    global_t *global     = global_get_ptr();
    settings_t *settings = config_get_ptr();
 
+   (void)global;
+
 #if defined(HAVE_OPENGL) && defined(HAVE_FBO)
    if (global->system.hw_render_callback.context_type)
    {

libretro_version_1.c

@@ -697,6 +697,7 @@ void retro_init_libretro_cbs(void *data)
       return;
 
    (void)driver;
+   (void)global;
 
    pretro_set_video_refresh(video_frame);
    pretro_set_audio_sample(audio_sample);

menu/drivers/rgui.c

@@ -281,6 +281,8 @@ static void rgui_render_messagebox(const char *message)
    if (!message || !*message)
       return;
 
+   (void)settings;
+
    list = string_split(message, "\n");
    if (!list)
       return;

menu/menu_entries_cbs_ok.c

@@ -596,6 +596,8 @@ static int action_ok_core_load(const char *path,
    if (!menu)
       return -1;
 
+   (void)global;
+
    menu_list_get_last_stack(menu->menu_list,
          &menu_path, NULL, NULL);