NAME
        GetExtSpriteA -- Attempt to get a sprite for the extended sprite
                                         manager. (V39)
        GetExtSprite -- varargs stub for GetExtSpriteA. (V39)
   SYNOPSIS
        Sprite_Number = GetExtSpriteA( sprite, tags )  (V39)
            d0                          a2      a1
        long getextspritea( struct extsprite *, struct tagitem * );
        spritenum=GetExtSprite(sprite,tags,...);
   FUNCTION
        Attempt to allocate one of the eight sprites for private use
        with the extended sprite manager.
   INPUTS
        sprite - ptr to programmer's extsprite (from allocspritedata()).
        tags - a standard tag list:
                GSTAG_SPRITE_NUM        specifies a specific sprite to get by number.
                GSTAG_ATTACHED specifies that you wish to get a sprite pair.
                        the tag data field points to a extsprite structure
                        for the second sprite. You must free both sprites.
   RESULTS
        Sprite_number = a sprite number or -1 for an error.
                This call will fail if no sprites could be allocated, or
                if you try to allocate a sprite which would require
                a mode change when there are other sprites of incompatible
                modes in use.
   BUGS
        GSTAG_ATTACHED does not work in version 39. When running under V39,
        you should attach the second sprite with a separate GetExtSprite call.
   SEE ALSO
        freesprite() changesprite() movesprite() getsprite() graphics/sprite.h