[MacPorts] #29770: cmake: remove platform darwin block

[MacPorts]

#29770: cmake: remove platform darwin block
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 Reporter:  ryandesign@…             |       Owner:  css@…           
     Type:  enhancement              |      Status:  assigned        
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.9.2           
 Keywords:  haspatch                 |        Port:  cmake           
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Changes (by css@…):

  * status:  new => assigned


Comment:

 I'll check the build results using otool. I need to make sure cmake
 doesn't pull in the wrong thing.

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Ticket URL: <https://trac.macports.org/ticket/29770#comment:1>
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