[MacPorts] #19070: lal: change pkgconfig to build dependency

[MacPorts]

#19070: lal: change pkgconfig to build dependency
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 Reporter:  ryandesign@…             |       Owner:  ram@…           
     Type:  defect                   |      Status:  new             
 Priority:  Normal                   |   Milestone:  Port Bugs       
Component:  ports                    |     Version:  1.7.0           
 Keywords:                           |        Port:  lal             
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 pkgconfig is a build dependency, not a library dependency. See attached
 patch.

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Ticket URL: <http://trac.macports.org/ticket/19070>
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