[MacPorts] #47909: p5-graphviz: update to version 2.18.

[MacPorts]

#47909: p5-graphviz: update to version 2.18.
----------------------+--------------------------
 Reporter:  devans@…  |      Owner:  ryandesign@…
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:            |       Port:  p5-graphviz
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 Looks like some renewed interest in this module upstream.  Latest changes:
 {{{
 Revision history for Perl module GraphViz.

 2.18  Thu May 28 08:43:00 2015
         - All patches to this version are from chrony, via a github pull
 request. With thanx.
         - Use File::Which on Windows to detect if Graphviz is present.
         - Clean up the code, including Build.PL and Makefile.PL.

 2.17  Mon Mar 30 08:56;00 2015
         - No code changes.
         - Create github repo. This has been done because ribasushi (Peter
 Rabbitson) has kindly offered
                 some patches. Hence I've reversed my policy of encouraging
 this module to die :-).
         - Update Build.PL and Makefile.PL to point to the repo. None of
 the pre-reqs were updated.

 }}}

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Ticket URL: <https://trac.macports.org/ticket/47909>
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