This should have been part of revision r469 but was missed as the XML files had
the subversion property svn:mime-type set to "application/xml". The files were
hence treated as binary files and no diff for the sopwithCamel was produced for
the 'flightgear-fgaddon_del_aircraft-dir.patch' patch attached to
http://thread.gmane.org/gmane.games.flightgear.devel/77094/focus=77214.
