[MacPorts] #29027: Update vala to 0.12.0

[MacPorts]

#29027: Update vala to 0.12.0
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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 0.12.0 just released.

 Here is an update for Portfile. See it in the attachement.

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Ticket URL: <https://trac.macports.org/ticket/29027>
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