Function xcb::ffi::randr::xcb_randr_get_crtc_gamma_unchecked

pub unsafe extern fn xcb_randr_get_crtc_gamma_unchecked(
    c: *mut xcb_connection_t, 
    crtc: xcb_randr_crtc_t
) -> xcb_randr_get_crtc_gamma_cookie_t