[MacPorts] #62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15

[MacPorts]

#62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15
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  Reporter:  tgyurci  |      Owner:  tessus
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  tmux     |
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Comment (by jmroot):

 Replying to [ticket:62708 tgyurci]:
 > When using the latest Xcode (12.4) on macOS 10.15, `configure` detects
 that `strtonum` is available, but it does not check whether it's really
 usable or not.

 Even when building against the 10.15 SDK, as MacPorts does by default?

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Ticket URL: <https://trac.macports.org/ticket/62708#comment:2>
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