[MacPorts] #51456: gnucash build failure with guile and guile18 installed

[MacPorts]

#51456: gnucash build failure with guile and guile18 installed
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  Reporter:  mopihopi@…  |      Owner:  drkp
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  gnucash     |
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Comment (by drkp):

 I still can't reproduce this for some reason, but can you see whether the
 above commit fixes it?

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Ticket URL: <https://trac.macports.org/ticket/51456#comment:14>
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