MFH: r408743

• Update net/asterisk11 to 11.21.2, which provides a fix for the old OpenSSL included in 9.x
• Backport the fis to net/asterisk (asterisk 1.8)
• net/asterisk13 already includes this fix, so remove my workaround

While here, asterisk 1.8 reached EOL on 2015-10-21, so DEPRECATE
it and add an expiration time.

Approved by: ports-secteam (feld)