Log Message:
Remove dependency on py-imagingtk.  pysolfc works fine without it.  The
problem wiz stumbled upon only occurs if py-imaging is installed and
py-imagingtk is not.  pysolfc assumed that if py-imaging was installed,
py-imagingtk was also installed.  patch-ac corrects this by simply
disabling the runtime detection of these optional dependencies.

The real issue, it seems to me, is that py-imaging installs ImageTk.py,
which needs py-imagingtk to be useful.  This is why pysolfc got
confused.  pkgsrc should probably be changed to install ImageTk.py in
the py-imagingtk package instead, but I'd rather not audit all
py-imaging users right now, so I'll leave that for someone else.

Bump PKGREVISION to 4.