[MacPorts] #58083: port:libtool should use depends_skip_archcheck-append for the xattr dependency

[MacPorts]

#58083: port:libtool should use depends_skip_archcheck-append for the xattr
dependency
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  Reporter:  RJVB     |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  libtool  |
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Comment (by ryandesign):

 I'm surprised nobody's run into this before. What's special about your
 situation that's causing you to see this error?

 The xattr dependency should be unused except on Mac OS X 10.4 Tiger. All
 later versions of macOS already include the `xattr` program.

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Ticket URL: <https://trac.macports.org/ticket/58083#comment:1>
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