Function g_sequence_insert_sorted 

pub unsafe extern "C" fn g_sequence_insert_sorted(
    seq: *mut _GSequence,
    data: *mut c_void,
    cmp_func: Option<unsafe extern "C" fn(*const c_void, *const c_void, *mut c_void) -> i32>,
    cmp_data: *mut c_void,
) -> *mut _GSequenceNode