Added --enable-lzo-stub configure option to build an OpenVPN client without LZO,...

Added --enable-lzo-stub configure option to build an OpenVPN client without LZO, but that has limited interoperability with LZO-enabled servers.

Modified "push-peer-info" option to push IV_LZO_STUB=1 to server when
client was built with --enable-lzo-stub configure option.  This tells
the server that the client lacks LZO capabilities, so the server
should turn off LZO compression for this client via "lzo no".

Added "setenv PUSH_PEER_INFO" option having the same effect as
"push-peer-info".

Version 2.1.3j

git-svn-id: http://svn.openvpn.net/projects/branches/BETA21@7023 e7ae566f-a301-0410-adde-c780ea21d3b5