[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 mascguy):

 Actually, the failures on 10.7 through 10.9 all related to `size_t` not
 being defined. And we might need to fix this in port `legacy-support`.

 CJones, is there an easy fix for this case, apart from potentially
 defining it [in `legacy-support`] when necessary?

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Ticket URL: <https://trac.macports.org/ticket/62959#comment:12>
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