Chris Bracken 67f952e952 Update cppwinrt to build 2.0.210304.5 (flutter/engine#24801)
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.
2021-03-04 18:21:33 -08:00
..