Make video_driver_is_threaded a public function

gfx/video_driver.c

@@ -274,7 +274,7 @@ static bool hw_render_context_is_gl(enum retro_hw_context_type type)
    return false;
 }
 
-static bool video_driver_is_threaded(void)
+bool video_driver_is_threaded(void)
 {
 #ifdef HAVE_THREADS
    settings_t *settings = config_get_ptr();

gfx/video_driver.h

@@ -339,6 +339,7 @@ void video_driver_set_own_driver(void);
 void video_driver_unset_own_driver(void);
 bool video_driver_owns_driver(void);
 bool video_driver_is_hw_context(void);
+bool video_driver_is_threaded(void);
 void video_driver_deinit_hw_context(void);
 struct retro_hw_render_callback *video_driver_get_hw_context(void);
 const struct retro_hw_render_context_negotiation_interface *video_driver_get_context_negotiation_interface(void);