[MacPorts] #34505: port cmake pkg-config broken on 2.8.8

[MacPorts]

#34505: port cmake pkg-config broken on 2.8.8
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 Reporter:  and.damore@…             |       Owner:  css@…           
     Type:  defect                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.1.0           
 Keywords:  haspatch                 |        Port:  cmake           
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 As per [http://www.cmake.org/Bug/print_bug_page.php?bug_id=13125 this bug
 report] cmake 2.8.8 introduced an error, the expecting PKG_CONFIG_FOUND
 variable is not set when the package is found.
 This can be reproduced building port avidemux whose cmake configuration
 halts printing bot "found pkg-config" and "pkg-config not found".

 I'm attaching patch.

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Ticket URL: <https://trac.macports.org/ticket/34505>
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