Fix building static podman-remote

[cevich]

Fixes #10656

As near as I can tell, sometime between v1.6.4 and v1.9 the definition
of LDFLAGS_PODMAN_STATIC was both created and lost. Additionally, after
a refactoring of the Makefile it was possible to enable CGO (which
will cause a dynamic binary to be built). Fix both issues by adding the
missing definition and forcing CGO to be disabled.

[cevich]

Alert/Danger/Warning/Caution: I don't know what I'm doing...just following some random blog post google dug up for me. A local test showed make podman-remote-static does now produce a static binary. But this might not be the correct way to do it.

It's also (obviously) not going to replace the v3.2.0 (and later) binaries already uploaded to the github release pages. I'm happy to fix that after this merges, but would prefer one of the official maintainers do it (mostly because I don't want to be blamed for getting it wrong) 😀

[mheon]

I don't think we can fix the 3.2.x already-built binaries easily. We can do subsequent releases, but backporting to existing tags seems like a bad idea.

[cevich]

backporting to existing tags seems like a bad idea.

Okay. Hmmm, we do have that nix-based alt-build. Maybe it produced a viable 3.2.0 static binary at the time...

[cevich]

...We have a winner! The static nix build for v3.2.0 was successful (Download), all it needs is sticking into a tarball 😃

[cevich]

(clicked the re-run buttons)

[cevich]

(clicked the re-run buttons again...and again)

[rhatdan]

LGTM
/approve

[openshift-ci]

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[mheon]

/lgtm