Remove dead code path and putenv functionality

The construct_name_value function call will always fail so this code path
is never used. Since we now always have a valid environment in
static_context->c2.es it is better to have a ASSERT(es) than to call this
code patch.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: David Sommerseth <davids@redhat.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: 1359889951-3369-1-git-send-email-arne@rfc2549.org
URL: http://article.gmane.org/gmane.network.openvpn.devel/7323
Signed-off-by: Gert Doering <gert@greenie.muc.de>