[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:
 Keywords:            |       Port:  gcc48
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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 gcc48. It was pointed out by Ken, it is needed to compile TenFourFox.
 The fix works. I have run the compiler test suite before and after and it
 has no adverse effects.

 I opened an upstream bug:
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87635

 I don't have faith in a new release of an unsupported compiler.
 I'd appreciate the inclusion in MacPorts as patches (and if 4.8.6 comes
 out.. we can remove them, can't we)

 I can also consider backporting them to gcc6, now that I am "expert".

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