[MacPorts] #57404: backport of cmath fixes for gcc48

[MacPorts]

#57404: backport of cmath fixes for gcc48
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  Reporter:  rmottola  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc48     |
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Comment (by kencu):

 I would support including this fix, if agreeable to others, and appreciate
 the work Riccardo has done on it to prove it's functional worth.

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Ticket URL: <https://trac.macports.org/ticket/57404#comment:2>
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