Function unqlite_sys::unqlite_create_constant

pub unsafe extern "C" fn unqlite_create_constant(
    pVm: *mut unqlite_vm, 
    zName: *const c_char, 
    xExpand: Option<unsafe extern "C" fn(_: *mut unqlite_value, _: *mut c_void)>, 
    pUserData: *mut c_void
) -> c_int