[MacPorts] #57448: i686-w64-mingw32-winpthreads and x86_64-w64-mingw32-winpthreads : linker does not accept syslibroot

[MacPorts]

#57448: i686-w64-mingw32-winpthreads and  x86_64-w64-mingw32-winpthreads : linker
does not accept syslibroot
-------------------------------------------------+-------------------------
  Reporter:  eviltwinskippy                      |      Owner:  mojca
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.5.4
Resolution:                                      |   Keywords:  mingw
      Port:  i686-w64-mingw32-winpthreads        |  mingw-w64
  x86_64-w64-mingw32-winpthreads                 |
-------------------------------------------------+-------------------------

Comment (by mojca):

 Thank you very much for the confirmation, I'll add this change to
 https://github.com/macports/macports-ports/pull/2891 then.

 I would like to upgrade to MinGW 6.0.0 as well (and do both changes at the
 same time), but apparently I'm now stuck with another bug with circular
 dependencies.

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Ticket URL: <https://trac.macports.org/ticket/57448#comment:13>
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