Update to upstream version 0.20.3; fixes see below

Detailed log:

• Update to upstream version 0.20.3
• Resolve c++ stdlib overlinking on FreeBSD-10, fixes [1]
• Promote HTTPD to default OPTION (proposal by jungleboogie0@gmail.com)
• Update REINPLACEs on example config file to match upstream changes
• Add additional hint on directory permissions and ownership for initial mpd service start in pkg-message.in
• Pet portlint

PR: 216371
Reported by: hideo@lastamericanempire.com