[MacPorts] #62704: fftw-3 upgrade fails: must set at least one Fortran variant

[MacPorts]

#62704: fftw-3 upgrade fails: must set at least one Fortran variant
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  Reporter:  jmroot  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  fftw-3  |
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Comment (by cjones051073):

 The reason is there are a number of ports the depend on fftw-3 with
 fortran support, and as such cannot be built in the buildbots because of
 this. Because it adds a minimal build dependency to enable it by default,
 and because the other fftw port already had it, I considered it a minor
 change that didnt need discussion.

 No need to revert the change entirely, just change it to default_fortran
 which then will allow the variant to be removed if required.

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Ticket URL: <https://trac.macports.org/ticket/62704#comment:9>
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