Parse compression options and bail out when compression is disabled

Parse compression options and bail out when compression is disabled

This change keeps the option parsing of compression options even when
compression is disabled. This allows OpenVPN to also refuse/reject
connections that try to use compression when compression is completely
disabled.

Patch v4: fix one missing USE_COMP

Change-Id: I9d7afd8f1d67d2455b4ec6bc12f4dcde80140c4f
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230324121050.1350913-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26512.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>