[MacPorts] #62959: py-grpcio: various buildbot failures

[MacPorts]

#62959: py-grpcio: various buildbot failures
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  Reporter:  mascguy         |      Owner:  mascguy
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  grpc py-grpcio  |
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Comment (by kencu):

 you need to make sure size_t is defined if
 {{{__MP_LEGACY_SUPPORT_SETATTRLISTAT__}}} is defined.

 It currently is not.

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Ticket URL: <https://trac.macports.org/ticket/62959#comment:15>
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