Remove exceptions to tested CMake versions

[Flamefire]

Those PRs have been merged:

• msm: Fix required CMake version msm#122
• pfr Fix compatibility with CMake < 3.14 pfr#223
• pfr CMake: Condition core_name tests on CMake version pfr#224

So the exceptions can be removed.

[pdimov]

Looks like boostorg/pfr#224 hasn't been merged.

Do you look for cmake_minimum_required in test/CMakeLists.txt? If so, maybe that should be added to PFR's test/CML, instead of conditioning the tests.

[Flamefire]

Looks like boostorg/pfr#224 hasn't been merged.

I added that when the CI failed and a checkbox to the description here.

Do you look for cmake_minimum_required in test/CMakeLists.txt? If so, maybe that should be added to PFR's test/CML, instead of conditioning the tests.

Not yet. Usually cmake_minimum_required should be done at the top-level CML anyway.
As for PFR: only a subset of the tests require C++20. In B2 those won't be build in C++17 mode or below. So that change mirrors that, building as much as possible. I don't see a need to error out when building the tests with an older CMake version