[MacPorts] #56102: protobuf-cpp, protobuf3-cpp: Install to different locations; don't conflict

[MacPorts]

#56102: protobuf-cpp, protobuf3-cpp: Install to different locations; don't conflict
-------------------------+-----------------------------------------
 Reporter:  ryandesign   |      Owner:  blair
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  protobuf-cpp, protobuf3-cpp
-------------------------+-----------------------------------------
 protobuf-cpp and protobuf3-cpp install their files to the same locations,
 and therefore conflict with one another. This is bad because these two
 ports are two different major versions of the library. Some software may
 require version 2 of the library, while other software may require version
 3.

 The two ports should install to different locations so that they can both
 be installed at the same time. They should no longer conflict with each
 other.

 If you change where one or both of the ports install their files, any
 ports currently depending on that port or ports needs to have its revision
 increased, and probably needs to be told how to find the moved files.

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Ticket URL: <https://trac.macports.org/ticket/56102>
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