irc/ircd-ratbox: Fix OpenSSL linking and simplify

• Fix linking with ports' ssl libs
• Fix contrib build (used base openssl headers)
• Re-work EGD detection
• Use options helpers
• Simplify REINPLACE with :U defaults

PR: 195796
Reviewed by: feld (mentor)
Approved by: feld (mentor)
Differential Revision: D5286