[MacPorts] #57284: arpack links with libgfortran.4.dylib without declaring dependency on libgcc7

[MacPorts]

#57284: arpack links with libgfortran.4.dylib without declaring dependency on
libgcc7
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  mamoll
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  arpack      |
-------------------------+----------------------

Comment (by MarcusCalhoun-Lopez):

 I created a [https://github.com/macports/macports-ports/pull/2739 pull
 request] to temporarily ameliorate the situation.

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Ticket URL: <https://trac.macports.org/ticket/57284#comment:2>
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