[MacPorts] #61216: Virtuoso-7 fail to install on OS 10.15 with XCode 12.0

[MacPorts]

#61216: Virtuoso-7 fail to install on OS 10.15 with XCode 12.0
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  Reporter:  JacquesLB   |      Owner:  nerdling
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.3
Resolution:              |   Keywords:
      Port:  virtuoso-7  |
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Comment (by sharris40):

 -Werror,-Wimplicit-function-declaration is a new default in Clang for
 Xcode 12. To fix it, you could just add the function prototype to an
 appropriate place via a patch. You could also just turn off the error, but
 then you'd be covering up the real problem.

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Ticket URL: <https://trac.macports.org/ticket/61216#comment:11>
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