Require a 1.2.x PolarSSL version

Upstream policy on PolarSSL API compatibility does not guarantee
stability between point-releases. For OpenVPN, we must verify a 1.2.x
version with the current codebase.

This fixes bug#343.

Signed-off-by: Josh Cepek <josh.cepek@usa.net>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <5284F32D.3000206@usa.net>
URL: http://article.gmane.org/gmane.network.openvpn.devel/7968
Signed-off-by: Gert Doering <gert@greenie.muc.de>