Fix build with curl 7.62.0
Fix build with curl 7.62.0

from CHANGES:
ssl: deprecate CURLE_SSL_CACERT in favour of a unified error code
Long live CURLE_PEER_FAILED_VERIFICATION

phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger