Reduce IV_OPENVPN_GUI_VERSION= to IV_GUI_VER=

Use shorter variable name to signal the same thing (see f3a2cd255a3bc73)
to save space in the buffer used by the collective IV_ info sent to server.

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1389296891-1487-1-git-send-email-gert@greenie.muc.de>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8183
(cherry picked from commit 7efaca734b8d633441ec3d7def2a2768864dedcf)