[MacPorts] #46635: libtool: update to 2.4.5; use xz

[MacPorts]

#46635: libtool: update to 2.4.5; use xz
---------------------------+----------------------
  Reporter:  ryandesign@…  |      Owner:  larryv@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.99
Resolution:                |   Keywords:  haspatch
      Port:  libtool       |
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Comment (by ryandesign@…):

 Using xz results in a smaller distfile download, and xz and its
 dependencies don't currently depend on libtool. However, it's possible one
 of them may at some point need to depend on libtool. For example, it was
 requested that gettext should depend on libtool in #38878. So maybe it is
 safer to stick with a distfile format that does not depend on another
 MacPorts port to be extracted. Perhaps a future version of MacPorts will
 be bundled with its own copy of the xz utils, as discussed recently on the
 mailing lists, and then it wouldn't be a problem.

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Ticket URL: <https://trac.macports.org/ticket/46635#comment:2>
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