Function xcb::ffi::xkb::xcb_xkb_set_map_values_vmodmap_length

pub unsafe extern "C" fn xcb_xkb_set_map_values_vmodmap_length(
    R: *const xcb_xkb_set_map_request_t, 
    S: *const xcb_xkb_set_map_values_t
) -> c_int