[MacPorts] #28807: Bump vala to 0.11.7

[MacPorts]

#28807: Bump vala to 0.11.7
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 Reporter:  anatol.pomozov@…          |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  1.9.2                                
 Keywords:                            |        Port:  vala                                 
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 Vala 0.11.7 just released. Here is a Portfile update.

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Ticket URL: <https://trac.macports.org/ticket/28807>
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