Function indy_sys::crypto::indy_unpack_message

#[no_mangle]
pub unsafe extern "C" fn indy_unpack_message(
    command_handle: CommandHandle, 
    wallet_handle: WalletHandle, 
    jwe_msg: BString, 
    jwe_len: u32, 
    cb: Option<ResponseSliceCB>
) -> Error