OpenSMTPD port updates

mail/opensmtpd:

• Update to 5.4.4p1
• Add LIBASRDEVEL option to depend on dns/libasr-devel
• Use OpenSSL from ports, should help with migration to LibreSSL
• Explicitly provide path to OpenSSL[1]

mail/opensmtpd-devel:

• Update to 201502012312
• Add LIBASR option to depend on dns/libasr
• Remove MYSQL, PGSQL, LDAP, and REDIS options as they're removed upstream
• Add a note for above to UPDATING
• Explicitly provide path to OpenSSL[1]
• Add a diff to fix build failure on FreeBSD[2]

Reported by: TJ <tj at mrsk.me> (via private email)
Submitted by: Herbert J. Skuhra <herbert at oslo.ath.cx> (via list)