Function xcb::ffi::xkb::xcb_xkb_get_names_value_list_groups_length

pub unsafe extern fn xcb_xkb_get_names_value_list_groups_length(
    R: *const xcb_xkb_get_names_reply_t, 
    S: *const xcb_xkb_get_names_value_list_t
) -> c_int