net-im/prosody: Update to 0.11.4

Changelog:

https://blog.prosody.im/prosody-0.11.4-released/

PR: 243460
Submitted by: Thomas Morper <thomas beingboiled info>
Approved by: portmgr (maintainer timeout: > 14 days)
MFH: 2010Q1 (blanket: bugfix release)