[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 eviltwinskippy):

 I can confirm that adding configure.sdkroot to the Portfile fixes builds
 on 10.14

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Ticket URL: <https://trac.macports.org/ticket/57448#comment:11>
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