sysutils/cfengine318: Mark IGNORE_SSL

• Fails to build with error: unknown type name 'RSA' which were deprecated in OpenSSL 3.0.0 and later
• Used IGNORE instead of BROKEN as upstream support for the community version has already ended.

Approved by: portmgr (blanket)

(cherry picked from commit 2d2556325079f9f4881d4954c4a8c463148e04cb)