[MacPorts] #32436: update protobuf-c to version 0.15

[MacPorts]

#32436: update protobuf-c to version 0.15
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 Reporter:  athundt@…          |       Owner:  macports-tickets@…                   
     Type:  update             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.3                                
 Keywords:                     |        Port:                                       
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 protobuf-c is outdated at version 0.13, the current version is 0.15

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Ticket URL: <https://trac.macports.org/ticket/32436>
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