https://skia.googlesource.com/skia.git/+log/5f2932e0e391..07ee548d5bcd

2021-03-07 reed@google.com Remove legacy picture-shader impl

If this roll has caused a breakage, revert this CL and stop the roller
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https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC kjlubick@google.com on the revert to ensure that a human
is aware of the problem.

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This fixes an issue in CppWinRT related to std::terminate(); the tool
now uses abort() instead.

CppWinRT patch: https://github.com/microsoft/cppwinrt/pull/868

This also fixes a couple bugs in the README.md:
* Uses tmp as the temp dir into which we unpack the nupkg archive rather
  than cppwinrt to avoid confusion with the containing directory, which is
  named cppwinrt.
* Fixes a typo around the directory from which the cipd command should
  be executed.