[MacPorts] #58690: mosh 1.3.2_4 doesn't build with clang >= 7.0

[MacPorts]

#58690: mosh 1.3.2_4 doesn't build with clang >= 7.0
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  Reporter:  lemzwerg  |      Owner:  quentinmit
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  lion
      Port:  mosh      |
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Comment (by quentinmit):

 I asked my neighborhood Clang developer. They told me that the `version`
 include is part of the C++20 standard. If we built with `-Wnonportable-
 include-path -Wnonportable-system-include-path` then clang would at least
 emit a better warning about the filename not matching, but there's
 currently no clang flag that will cause it to ignore the file named
 `VERSION` and continue looking for a file called `version`.

 Do we have a sense for how widespread this is? So far we have `mosh` and
 `qt4-mac` affected; are there many other packages? (Seems likely, since
 "VERSION" is a super common filename?)

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Ticket URL: <https://trac.macports.org/ticket/58690#comment:7>
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