pfPorts: Sync openvpn 2.3 port (FreeBD port r310670)

Suck in all optimizations made upstream, keep our modifications
(disable EASYRSA, enable PW_SAFE)

Upstream commit message at sync:
Author: mandree <mandree@FreeBSD.org>
Date:   Sun Jan 20 02:55:48 2013 +0000

    - When installing from port, do not tamper with permissions of other files
      in ${PREFIX}/sbin and ${PREFIX}/lib. [1]

    - Do not install plugin .la/.so files with the executable bit set, they
      are not executable.

    PR:         ports/175434 [1]
    Submitted by:       Benjamin Lorenz [1]