[MacPorts] #68300: premake5 @5.0.0-beta2: error: call to undeclared function 'getpid'; ISO C99 and later do not support implicit function declarations

[MacPorts]

#68300: premake5 @5.0.0-beta2: error: call to undeclared function 'getpid'; ISO C99
and later do not support implicit function declarations
-----------------------+----------------------
  Reporter:  Iritscen  |      Owner:  amake
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sonoma
      Port:  premake5  |
-----------------------+----------------------

Comment (by ryandesign):

 Might as well include this in the patch as well which fixes the same
 problem on non-Mac systems, in case anybody is trying to use MacPorts to
 install this port on Linux:

 https://github.com/premake/premake-
 core/commit/da607b872376db17d2e2928dde76f771e48b020e

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Ticket URL: <https://trac.macports.org/ticket/68300#comment:5>
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