[MacPorts] #55650: Update protobuf3-cpp to version 3.5.1

[MacPorts]

#55650: Update protobuf3-cpp to version 3.5.1
----------------------------------+----------------------
  Reporter:  MarcusCalhoun-Lopez  |      Owner:  blair@…
      Type:  update               |     Status:  closed
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:  fixed                |   Keywords:  haspatch
      Port:  protobuf3-cpp        |
----------------------------------+----------------------

Comment (by kencu):

 Just FYI, protobuf3-cpp also offers another way to build on systems that
 don't offer thread_local storage:
 {{{
 configure.cppflags-append  -DGOOGLE_PROTOBUF_NO_THREADLOCAL
 }}}

 I've been using this flag for a year or so now to build this on 10.6.8 /
 libc++ . It also works on a couple of other ports that include protobuf3
 internally.

 {{{
 $ port -v installed protobuf3-cpp
 The following ports are currently installed:
   protobuf3-cpp @3.5.1_0 (active) platform='darwin 10' archs='x86_64'
 date='2018-01-06T11:02:57-0800'
 }}}

 {{{
 $ otool -L /opt/local/lib/libprotobuf.15.dylib
 /opt/local/lib/libprotobuf.15.dylib:
         /opt/local/lib/libprotobuf.15.dylib (compatibility version 16.0.0,
 current version 16.1.0)
         /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current
 version 1.2.11)
         /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current
 version 5.0.1)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 125.2.11)
         /usr/lib/libc++abi.dylib (compatibility version 1.0.0, current
 version 5.0.1)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55650#comment:2>
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