[MacPorts] #16437: cdf: enable nice build (don't override build phase)

[MacPorts]

#16437: cdf: enable nice build (don't override build phase)
-------------------------------------+--------------------------------------
 Reporter:  ryandesign at macports.org  |       Owner:  gwright at macports.org
     Type:  defect                   |      Status:  new                 
 Priority:  Normal                   |   Milestone:  Port Bugs           
Component:  ports                    |     Version:  1.6.0               
 Keywords:                           |  
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 cdf overrides the build phase, thus it doesn't obey the "buildnicevalue"
 setting that users can set in macports.conf. The attached patch fixes
 this.

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Ticket URL: <http://trac.macports.org/ticket/16437>
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