Make homedir functions work on Windows

[rhatdan]

Needed for containers/podman#12503

Signed-off-by: Daniel J Walsh dwalsh@redhat.com

[rhatdan]

@n1hility PTAL

[rhatdan]

@giuseppe @nalind @vrothberg @ashley-cui @umohnani8 @flouthoc @saschagrunert PTAL

[vrothberg]

LGTM, thanks @rhatdan

[n1hility]

@rhatdan LGTM but as a disclaimer, technically Windows apps often use %LocalAppData%[name of app] -> which is [user's home]\AppData\Local\[e.g. Podman]) In my draft win podman machine PR I just kept the Linux podman conventions and planned to revisit since I wasn't sure if it should be Local\Containers\Podman or Local\Podman\Containers. Also there isn't really an equivalent of XDG_CONFIG_HOME, so something would have to be made up there. I personally think it's fine to leave it like this so, but up to you guys if we should be stricter adherents to the OS convention over an app convention.

[rhatdan]

I am fine with fixing this to match Microsoft, perhaps we just do a if runtime.GOOS="windows" or make the functions in separate windows source code.