[MacPorts] #68889: proj6 build error: error: 'int64_t' in namespace 'std' does not name a type

[MacPorts]

#68889: proj6 build error: error: 'int64_t' in namespace 'std' does not name a type
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  Reporter:              |      Owner:  stromnov
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  tiger, leopard, snowleopard,
      Port:  proj6       |  powerpc
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Comment (by barracuda156):

 This has to be backported:
 https://github.com/OSGeo/PROJ/commit/b0b8937c56ced8eb0ffef532b9c691a1a5fc8634

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Ticket URL: <https://trac.macports.org/ticket/68889#comment:1>
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