[MacPorts] #55594: libuv @1.18.0 does not build on PPC Tiger because configure does not determine that unsetenv() is a void function?

[MacPorts]

#55594: libuv @1.18.0 does not build on PPC Tiger because configure does not
determine that unsetenv() is a void function?
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  Reporter:  ballapete  |      Owner:  michaelld
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  tiger
      Port:  libuv      |
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Comment (by kencu):

 this is essentially the same isssue as the cmake 3.10 build failure on
 Tiger we are working on, which also fails building libuv.

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Ticket URL: <https://trac.macports.org/ticket/55594#comment:3>
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