Fix Windows Build CMP0135 Policy Deprecation

[TK5gL2dS5uwQc]

Addresses #522

Regarding this Policy: https://cmake.org/cmake/help/latest/policy/CMP0135.html
Setting Policy: https://cmake.org/cmake/help/latest/command/cmake_policy.html#setting-policies-explicitly

• I've read and followed CONTRIBUTING.md

[TK5gL2dS5uwQc]

First time contributing to a public GitHub repo. Please let me know if I need to do something additional.

[greenrobot-team]

Thank you! I'll have a look when I have time.

For me: from a first look the used option is not added until 3.24, but the minimum supported CMake is lower. Check how that works on older versions. Also the docs note that enabling specific policies is discouraged.

[TK5gL2dS5uwQc]

Ok, great. I'll take a look at those docs and figure out why these checks* are failing later, potentially today.

[greenrobot-team]

@ikelly963 Don't worry about the failling checks. pana fails because I need to still adjust the threshold and coverage just has no permission to upload the report because this is a branch outside of this repo.

[greenrobot-team]

The Flutter folks have a better fix. But I'm not sure it's still needed. See #522 (comment)