Function xcb::ffi::randr::xcb_randr_get_crtc_gamma_size

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