More concretely utilize local modules in our CMake code. (#17022)

* Properly handle systemd.cmake as a module.

* Split CMake compiler flag handling functions to their own module.

* Add include guards to modules.

* Prefix module names with Netdata.

This ensures that we end up using our local modules instead of possibly
using a system module with the same name.

* Drop include guards.

And shift systemd detection code to a macro so it’s less dangerous to
import the module multiple times.

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