[kde-freebsd] koffice build failure after GraphicsMagick update

[Jan Henrik Sylvester]

With the GraphicsMagick update, koffice got its PORTREVISION bumped.

Anyhow, koffice seems to depend on the old GraphicsMagick API -- I got 
the same error as described here: http://bugs.kde.org/show_bug.cgi?id=161770