[MacPorts] #40685: atlas: add gnutar dependency

[MacPorts]

#40685: atlas: add gnutar dependency
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  Reporter:  sebastian@…  |      Owner:  vince@…
      Type:  defect       |     Status:  reopened
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:  mavericks haspatch
      Port:  atlas        |
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Comment (by ryandesign@…):

 [https://sourceforge.net/p/math-atlas/support-requests/884/ The developer
 has been made aware] of the problem and found a solution which is in the
 3.11 development branch and may be backported to the 3.10 branch.

 Meanwhile here's a new patch to allow extract to succeed with BSD tar.

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Ticket URL: <https://trac.macports.org/ticket/40685#comment:12>
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