[MacPorts] #38835: protobuf*: upgrade to 2.5.0

[MacPorts]

#38835: protobuf*: upgrade to 2.5.0
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 Reporter:  dhalperi@…  |      Owner:  macports-tickets@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.3
 Keywords:              |       Port:
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 Google released v. 2.5.0 on Feb 27 of this year
 (http://protobuf.googlecode.com/svn/trunk/CHANGES.txt). Let's upgrade the
 MacPorts packages to match.

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Ticket URL: <https://trac.macports.org/ticket/38835>
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