[MacPorts] #62027: qt5-qtwebkit fails to build on Big Sur 11.1 with Apple silicon

[MacPorts]

#62027: qt5-qtwebkit fails to build on Big Sur 11.1 with Apple silicon
---------------------------+---------------------------------
  Reporter:  dfleck        |      Owner:  MarcusCalhoun-Lopez
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:  bigsur arm64
      Port:  qt5-qtwebkit  |
---------------------------+---------------------------------

Comment (by jhoyt4):

 ok - so I now have this compiling on ARM.

 I needed to patch FastMalloc.cpp for ARM

 Also needed to patch Source/WTF/wtf/Platform.h to add logic for ARM64
 aarch64 (thanks to a pointer from apple here:
 [https://opensource.apple.com/source/WTF/WTF-7601.1.46.42/wtf/Platform.h.auto.html]

 Finally needed to patch Source/JavaScriptCore/heap/MachineStackMarker.cpp
 to accept the new CPU(ARM64) call put into Platform.h.

 I'm still having issues getting mythtv to compile so I have not been able
 to test beyond compiling.  I'm going to post a PR soon and hopefully I can
 get some help from someone to fully test this.

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Ticket URL: <https://trac.macports.org/ticket/62027#comment:38>
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