Log Message:
libgdk-x11 provided by this package directly uses libXft.
So include buildlink for Xft2.

Also, the build which uses newer freetype includes
needs a newer Xft.h. So depend on Xft2>=2.1.2nb2.
(I didn't bump in the Xft2's buildlink3 because maybe
other packages don't need that new Xft.h.)
This will close PR #25548.