Add warning when landlock lsm is not available

pwmt / zathura

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Add warning when landlock lsm is not available #661

Closed valoq closed 3 months ago

valoq commented 3 months ago

When zathura-sandbox is build with landlock support but the kernel does not include the landlock lsm, show an error to inform the user about the missing protection.

Partly fixes #654