[MacPorts] #31110: Add Closure Linter and py-gflags dependency.

[MacPorts]

#31110: Add Closure Linter and py-gflags dependency.
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 Reporter:  pope@…                |       Owner:  macports-tickets@…                   
     Type:  submission            |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  2.0.2                                
 Keywords:                        |        Port:  closure-linter                       
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Ticket URL: <https://trac.macports.org/ticket/31110>
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