[AD] What does ALLEGRO_PIXEL_FORMAT_ANY_NO_ALPHA mean?

[SiegeLord <siegelordex@xxxxxxxxxx>]

Currently, if you do 
al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ANY_NO_ALPHA) Allegro will 
occasionally choose a format with an alpha channel. Is that the correct 
behavior?

Additionally, on OpenGL, ALLEGRO_PIXEL_FORMAT_XBGR_8888 and similar are 
actually identical to ALLEGRO_PIXEL_FORMAT_ABGR_8888 and will draw as if 
they have alpha... should ALLEGRO_PIXEL_FORMAT_ANY_NO_ALPHA return those 
somewhat unreliable 32 bit X variants or just return the 24 bit format?

-SL