Adjusted autotools files to build more cleanly on newer autoconf/automake versions

Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <1389803764-5879-1-git-send-email-davids@redhat.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8239
Signed-off-by: Gert Doering <gert@greenie.muc.de>