[MacPorts] #61470: Detex fails to build on Big Sur because of invalid implicit declaration in C99

[MacPorts]

#61470: Detex fails to build on Big Sur because of invalid implicit declaration in
C99
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  Reporter:  hnarayanan  |      Owner:  ryandesign
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  detex       |
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Comment (by neilt):

 Yep, same here while trying to build octave.

 {{{
 detex @2.8_1

 ProductName:    macOS
 ProductVersion: 11.0.1
 BuildVersion:   20B28
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61470#comment:2>
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