Remove the --disable-eurephia configure option

Remove the --disable-eurephia configure option

This "feature" has been enabled since OpenVPN 2.2 without any reports that
this has been causing issues.  All it does is to add an extra environment
variable 'tls_digest_{n}' with the certificate SHA1 fingerprint/digest
hash.

Lets just simplify things by removing the possibility to disable this
environment variable.

Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1370600123-6029-1-git-send-email-dazo@users.sourceforge.net>
URL: http://article.gmane.org/gmane.network.openvpn.devel/7660
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit e3d388652f59fd2ddd9c7f470f7ef62ee6b35595)