ports/167689: Update port deskutils/calibre to 0.8.50

[culot at FreeBSD.org]

Synopsis: Update port deskutils/calibre to 0.8.50

Responsible-Changed-From-To: freebsd-ports-bugs->culot
Responsible-Changed-By: culot
Responsible-Changed-When: Mon May 7 17:07:47 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=167689