Function g_object_dup_qdata

pub unsafe extern "C" fn g_object_dup_qdata(
    object: *mut GObject,
    quark: u32,
    dup_func: Option<unsafe extern "C" fn(*mut c_void, *mut c_void) -> *mut c_void>,
    user_data: *mut c_void,
) -> *mut c_void