[MacPorts] #23199: Update doxygen-1.6.2

[MacPorts]

#23199: Update doxygen-1.6.2
------------------------------+---------------------------------------------
 Reporter:  css@…             |       Owner:  css@…           
     Type:  update            |      Status:  new             
 Priority:  Normal            |   Milestone:                  
Component:  ports             |     Version:  1.8.2           
 Keywords:                    |        Port:  doxygen         
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 doxygen 1.6.2 has been released, among the
 [http://www.stack.nl/~dimitri/doxygen/changelog.html changes] is support
 for Snow Leopard as an official build platform. That can eliminate the
 patch to `patch-qtools_qglobal.h.diff`.

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Ticket URL: <http://trac.macports.org/ticket/23199>
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