graphviz +ocaml and swig bugs

[Alexy Khrabrov]

Just a heads up about a problem with graphviz +ocaml -- when trying to  
build, first you'll encounter a bug in swig, and if you manage to fix  
it, then you'll run into a bug in graphviz.  The swig bug is reported  
in RedHat and a patch is provided:

https://bugzilla.redhat.com/show_bug.cgi?id=485540

  -- I've extracted, applied it -- fixes -- and submitted ticket https://trac.macports.org/ticket/18745 
  for it.

The graphviz is supposed to be fixed in 2.22 -- didn't check yet --  
the bug in ocaml bindings is described in

http://www.graphviz.org/bugs/b1586.html

-- I manually fixed it in the same way in the work/ source.  According  
to John Ellson of graphviz, the 2.22 is ready to be macportized.

The swig bug bothers me a bit as it seems a RedHat patch and I'm not  
sure it's reported upstream.

Cheers,
Alexy