Function allegro_color_sys::allegro_color::al_color_rgb_to_hsl

pub unsafe extern fn al_color_rgb_to_hsl(red: c_float,
                                         green: c_float,
                                         blue: c_float,
                                         hue: *mut c_float,
                                         saturation: *mut c_float,
                                         lightness: *mut c_float)