`runc features` and `runc -v` should expose libpathrs version

[AkihiroSuda]

runc features should expose annotations related to libpathrs (i.e., whether it is enabled or not, and, its version)

Similar to:

runc/types/features/features.go

Lines 15 to 24 in 5c48e21

	// AnnotationRuncCheckpointEnabled is set to "true" if CRIU-based checkpointing is supported.
	// Unrelated to whether the host supports CRIU or not.
	// Always set to "true" in the current version of runc.
	// This is defined as an annotation because checkpointing is a runc-specific feature that is not defined in the OCI Runtime Spec.
	// Third party implementations such as crun and runsc MAY use this annotation.
	AnnotationRuncCheckpointEnabled = "org.opencontainers.runc.checkpoint.enabled"
	// AnnotationLibseccompVersion is the version of libseccomp, e.g., "2.5.1".
	// Note that the runtime MAY support seccomp even when this annotation is not present.
	AnnotationLibseccompVersion = "io.github.seccomp.libseccomp.version"

It should be printed in runc --version too

runc/main.go

Line 52 in 5c48e21

fmt.Fprintf(w, "libseccomp: %d.%d.%d\n", major, minor, micro)

[cyphar]

Yeah I agree, I will add an API to libpathrs to get the libpathrs version (akin to what libseccomp does). I wanted to avoid too many libpathrs-specific changes in the libpathrs PR (right now we don't even directly import it).

The only question is what to do for current libpathrs versions, we can do dlopen on /proc/self/exe to try to find the symbol or just bump the minimum version requirement...

[AkihiroSuda]

just bump the minimum version requirement...

This seems fine, as no distro except tumbleweed has packaged it yet
https://pkgs.org/search/?q=pathrs