Simplify handling of supporting_certs
Simplify handling of supporting_certs

Dispense with the "if supporting_certs is non-NULL then use it else there's
a single certificate in cert" logic. It's complex and pointless. We can live
with an extra allocation in the "fast path", for $DEITY's sake.

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

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