[MacPorts] #38708: py-astropy: use external, MacPorts cfitsio, expat, and wcslib; drop redundant python.default_version

[MacPorts]

#38708: py-astropy: use external, MacPorts cfitsio, expat, and wcslib; drop
redundant python.default_version
--------------------------+--------------------------
  Reporter:  aronnax@…    |      Owner:  robitaille@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:
      Port:  py-astropy   |
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Comment (by aronnax@…):

 Yes, I noticed the build failures. The problem was a missing build
 dependency on pkgconfig, fixed in r105490. I didn't notice the dependency
 on pkgconfig because I only did test builds on my own machine, which
 already had pkgconfig.

 Sorry about that. I should have tested it more thoroughly, and I probably
 should have alerted you of the buildbot failures and the cause, rather
 than committing r105490 straightaway.

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Ticket URL: <https://trac.macports.org/ticket/38708#comment:5>
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