[MacPorts] #60106: nodejs12/13 fail to build on older OSX

[MacPorts]

#60106: nodejs12/13 fail to build on older OSX
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  Reporter:  dubiousjim  |      Owner:  ci42
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  nodejs13    |
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Changes (by dubiousjim):

 * Attachment "patch-anonymous.diff" added.

 patch MAP_ANONYMOUS to fallback to MAP_ANON

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Ticket URL: <https://trac.macports.org/ticket/60106>
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