ports/171463: Update port deskutils/calibre to 0.8.68

[bdrewery at FreeBSD.org]

Synopsis: Update port deskutils/calibre to 0.8.68

Responsible-Changed-From-To: freebsd-ports-bugs->bdrewery
Responsible-Changed-By: bdrewery
Responsible-Changed-When: Sun Sep 9 02:10:12 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=171463