Fix Solaris build
Fix Solaris build

Broken by commit f8fbc0b3 ("Add vpn_perror() macro and use it instead of
perror()") which makes link_proto() use a 'vpninfo' variable it doesn't
have.

Signed-off-by: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>

don-johnny/openconnect,liiir1985/openconnect,cernekee/openconnect,lins05/openconnect,matlockx/openconnect,mveplus/openconnect-client,nmav/openconnect-mine,cernekee/openconnect,liiir1985/openconnect,don-johnny/openconnect,mveplus/openconnect-client,lins05/openconnect,brandt/openconnect,atyndall/openconnect,mveplus/openconnect-client,atyndall/openconnect,nmav/openconnect-mine,liiir1985/openconnect,cernekee/openconnect,mtmiller/openconnect,nmav/openconnect-mine,mtmiller/openconnect,mtmiller/openconnect,don-johnny/openconnect,mtmiller/openconnect,matlockx/openconnect,matlockx/openconnect,brandt/openconnect,lins05/openconnect,brandt/openconnect,nmav/openconnect-mine,lins05/openconnect,cernekee/openconnect,don-johnny/openconnect,atyndall/openconnect,matlockx/openconnect,liiir1985/openconnect,mveplus/openconnect-client,brandt/openconnect,atyndall/openconnect