Use Make GVPROXY_PATH to locate gvproxy

[jonpspri]

Presented as an alternative to PR #11449

Rather than do backflips in the code to locate gvproxy, use a
build-time variable to set the location. That variable can default to
/usr/libexec but other build packages (e.g. Homebrew) can set it to
something of their liking.

I'll take no offense if the consensus is that we do not want to pollute
the build, but we should likely add a runtime configuration parameter as an
alternative in that case.

Fixes: #11226

Signed-off-by: Jonathan Springer jonpspri@gmail.com

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[jonpspri]

See https://github.com/jonpspri/homebrew-core/blob/0d3d991c9e23892fba506e547984bb76acfa134d/Formula/podman.rb#L48 for an example of this patch in use in a Homebrew recipe.

@ashley-cui

[Luap99]

I don't like this as compile option, I created containers/common#758 to add this to the containers.conf file. With that everyone can configure this without having to recompile.

[vrothberg]

I don't like this as compile option, I created containers/common#758 to add this to the containers.conf file. With that everyone can configure this without having to recompile.

I concur with @Luap99. I prefer this be a runtime option rather than a compile-time option.

[rhatdan]

Lets do this at runtime.

[StephenWithPH]

Linking to NixOS/nixpkgs#141041 (comment) . Build-time linking would have been quite handy for packaging podman in nix.