Fix MSVC CI

[alexreinking]

Fixes #68

[JohelEGP]

How about disabling https://github.com/modern-cmake/cppfront/blob/main/regression-tests/cmake/CMakeLists.txt.in#L14?
Then __cpp_modules won't be defined.
It'll do the same as Clang and GCC, "fake it till you make it".

[alexreinking]

How about disabling https://github.com/modern-cmake/cppfront/blob/main/regression-tests/cmake/CMakeLists.txt.in#L14? Then __cpp_modules won't be defined. It'll do the same as Clang and GCC, "fake it till you make it".

No, didn't work. Still get

C1011: cannot locate standard module interface. Did you install the library part of the C++ modules feature in VS setup?

[JohelEGP]

__cpp_modules is still defined: https://compiler-explorer.com/z/naqe3exsY.

[JohelEGP]

26fac8d broke the build another way.