[MacPorts] #56252: macosx_version should contain the full macOS version

[MacPorts]

#56252: macosx_version should contain the full macOS version
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 Reporter:  ryandesign   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.4.99
 Keywords:               |       Port:
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 I'd like to see the full macOS version (e.g. `10.12.6`) [ticket:52575 in
 the main.log], but annoyingly, `macosx_version` only contains the major
 macOS version (e.g. `10.12`).
 [changeset:94e87f11199ca14c8b8a554d84e675eaa9db917c/macports-base Jeremy
 briefly changed it to the full version], but there are places in MacPorts
 base that assume it is only the major version, so that change was quickly
 reverted.

 Can we revisit this idea of changing (some might say correcting) the
 meaning of `macosx_version`? Most of the ports that use the variable
 already accommodate this, since they use `vercmp` when testing that
 variable. I [changeset:35e1788ba94778e0e024b566c9858100a2e214c3/macports-
 ports fixed the wine ports] which were doing the comparison wrong, and I
 [https://github.com/macports/macports-ports/pull/1553 sent a PR for
 libcxx]; after that's merged, all the ports should be ok.

 Base still has a few places that use string comparison on that variable,
 but I'm happy to fix those up if we agree to make this change.

 Alternately, we could keep `macosx_version` as is and add a new variable
 for the full version, as [https://lists.macports.org/pipermail/macports-
 dev/2013-October/024675.html Josh suggested], but I don't think that's the
 best solution.

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Ticket URL: <https://trac.macports.org/ticket/56252>
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