Fix --disable-ssl builds, were broken by cleanup in 63dc03d.

Wrap ssl_verify.h in "#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL)" to
make it empty for --disable-ssl builds.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1401737019-15702-1-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8763
Signed-off-by: Gert Doering <gert@greenie.muc.de>