Unused load_intro_gfx() in client gui API
Also its counterpart, free_intro_radar_sprites(), is not really needed. Those functions are not currently completely empty, but they still do nothing - they only (conditionally) free what load_intro_gfx() has never allocated.
gui-sdl2 and gui-stub have load_intro_gfx() that is never called. It's also listed in graphics_g.h as part of the API.