[MacPorts] #56309: gpsd: enhance to avoid conflict with mach policy_t type via forthcoming Boost 1.67.0

[MacPorts]

#56309: gpsd: enhance to avoid conflict with mach policy_t type via forthcoming
Boost 1.67.0
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  Reporter:  michaelld    |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  gpsd, boost  |
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Comment (by michaelld):

 Upstream committed this patch, or something equivalent, to fix the issue.
 There is no new release yet, so we need to patch locally. I'm going to go
 ahead and do so by the end of the week unless someone directs me not to.
 This is a critical building issue with Boost 1.67.0+, and I'm trying to
 get those dealt with so that I cxan update Boost to 1.68.0.

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Ticket URL: <https://trac.macports.org/ticket/56309#comment:3>
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