[MacPorts] #15321: libpng: Enable parallel building.

[MacPorts]

#15321: libpng: Enable parallel building.
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 Reporter:  nox at macports.org  |       Owner:  waqar at macports.org
     Type:  enhancement       |      Status:  new               
 Priority:  Normal            |   Milestone:  Port Enhancements 
Component:  ports             |     Version:  1.6.0             
 Keywords:  parallel          |  
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 Here is a patch to enable parallel building in libpng.

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Ticket URL: <http://trac.macports.org/ticket/15321>
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