Update SoftEther VPN to the latest rtm version 4.29-9680

Compile tested: Atheros AR7xxx/AR9xxx, TP-LINK Archer C7 v2, 18.06.4

Signed-off-by: Philipp Schuster <philippschuster@gmx.com>
(rebased and refreshed patches).
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Needs -liconv.

Also fixed compilation without deprecated OpenSSL APIs.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Add OPENSSL_init_crypto to deprecated patch
Co-Authored-By: Eneas Queiroz <cote2004-github@yahoo.com>