[MacPorts] #57396: Use hfscompression on buildbot

[MacPorts]

#57396: Use hfscompression on buildbot
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by ryandesign):

 What would be sufficiently recent? Neither `man bsdtar` nor `bsdtar
 --help` mentions an `--hfsCompression` option, on any version of macOS.

 The disk space problem is more acute on older versions of macOS, given how
 many different versions of clang need to be installed to build C++11
 ports. So I'm looking for a solution that works on older systems as well.

 What's the recommended way to determine whether files are already
 hfscompressed? I found a third-party afsctool that claims to be able to do
 it, and Apple's hfsdebug apparently can too.

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Ticket URL: <https://trac.macports.org/ticket/57396#comment:2>
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