kea-premium: own build system
Kea Premium could have it's own build system that installs required libraries for Kea then to load.
It could be made such that each library has it's own build sub-system which can be triggered as standalone or by the parent system.
This makes development & packaging easier and allows for better separation of concerns. Kea won't need to be aware of the premium hook libraries.
And it would be a great candidate for the meson build system.
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