Fix const char * warnings in GnuTLS pin_helper on FreeBSD
Fix const char * warnings in GnuTLS pin_helper on FreeBSD

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

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