Add /usr/libexec to default binary helper dirs

[baude]

The recent addition of virtiofsd to podman now requires podman to resolve the path for the virtiofsd executable. the binary lives in /usr/libexec which is not one of the defaults for Linux. Here I want to add /usr/libexec to the default list.

This fixes containers/podman#23127

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[baude]

@rhatdan @Luap99 should i also change the defaults in pkg/config/containers.conf ? I choose no to because I assume that file needs to be valid on Macs/Windows? If not, happy to add and update the man page too.

[Luap99]

see the discussions on the machine PR.
containers/podman#22920 (comment)

Add new dirs here is not scalable at all. Other distros do not use this path, etc..
The best way is to add the symlink which is already done in podman-machine.

[baude]

I hate this solution. It does nothing for other distributions, developers who use upstream code, etc.

[Luap99]

It does nothing for other distributions

Neither does this PR which is why it is not scalable. We cannot just hard code a bunch of paths here because every distro ships it in a another location.

If you prefer to hard code paths then you can do so on the podman side but again it doesn't scale across distros.

[afbjorklund]

I hate this solution. It does nothing for other distributions, developers who use upstream code, etc.

You also forgot to add /usr/local/libexec to the list.