systemd-boot reports its features via the LoaderFeatures EFI variable. Let's add something similar for stub features, given they have been growing. For starters only define four feature flags. One is a baseline feature we pretty much always supported (see comment in code), two are features added in one of the most recently released systemd version, and the final one, is a feature we added a few commits ago. This is useful for userspace to figure out what is supported and what not.
System and Service Manager
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