libXext/buildlink3.mk, now that it is included there.
Leave the places where its API version is set or variables from it
are used directly (about 3 packages).
were moved or renamed.
This was for some from 2008 and 2009 and one from 2001.
Also I noticed that a CHANGES entry was wrong as said "Renamed"
when should have said "Moved" (lua-OSBF) because PKGBASE stayed the
same.