Make kea to build on last macOS / Xcode

I updated macOS, Xcode, all brewed dependencies, libyang/sysrepo. I am trying to make Kea with premium to build with all options on. Unfortunately the last clang (1001.0.46.3) does not accept some features.

This ticket is to fix all issues which block build and make check on macOS (the idea is they should block on some other systems too).

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