(GX) crash/compile fixes

console/griffin/hook.h

@@ -98,6 +98,8 @@
 #define video_set_aspect_ratio_func(aspectratio_idx) gx_set_aspect_ratio(driver.video_data, aspectratio_idx)
 #define video_stop_func()			gx_stop()
 #define video_start_func()			gx_start()
+#define video_viewport_size_func(width, height) ((void)0)
+#define video_read_viewport_func(buffer)        (false)
 
 #define input_init_func()                       gx_input_initialize()
 #define input_poll_func()                       gx_input_poll(driver.input_data)

console/rgui/rgui.c

@@ -417,9 +417,6 @@ static void render_text(rgui_handle_t *rgui)
 static void rgui_settings_toggle_setting(rgui_file_type_t setting, rgui_action_t action, rgui_file_type_t menu_type)
 {
    unsigned port = menu_type - RGUI_SETTINGS_CONTROLLER_1;
-#ifdef GEKKO
-   gx_video_t *gx = (gx_video_t*)driver.video_data;
-#endif
 
    switch (setting)
    {

gx/frontend/main.c

@@ -348,6 +348,7 @@ int main(void)
    input_gx.init();
 
    video_gx.start();
+   driver.video = &video_gx;
 
    gx_video_t *gx = (gx_video_t*)driver.video_data;
    gx->menu_data = menu_framebuf;