[MacPorts] #57656: backport of cmath fixes for gcc65

[MacPorts]

#57656: backport of cmath fixes for gcc65
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 Reporter:  rmottola                  |      Owner:  (none)
     Type:  defect                    |     Status:  new
 Priority:  Normal                    |  Milestone:
Component:  ports                     |    Version:
 Keywords:  gcc6 leopard snowleopard  |       Port:  gcc6
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 I backported this fix:

 ​https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=244231

 of which the comments are:
 ​https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79017

 Contrary to the original bug, it is not PPC only, but x86 too

 to gcc65.

 this is the companion of #57404

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Ticket URL: <https://trac.macports.org/ticket/57656>
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