[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?
------------------------+-----------------------
  Reporter:  ballapete  |      Owner:  michaelld
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  tiger
      Port:  libuv      |
------------------------+-----------------------

Comment (by kencu):

 I think I mostly have this licked, except for a few test failures I see on
 10.4 that I don't see elsewhere, that I would like to fix
 {{{
 $ port -v installed libuv
 The following ports are currently installed:
   libuv @1.23.2_0 (active) platform='darwin 8' archs='ppc'
 date='2018-11-10T14:34:56-0800'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55594#comment:4>
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