guix: pack: Only wrap executable files.series-3031

Hello Guix,

This patch fixes some uses of relocatable git (e.g.  octopus merge).
Previously, guix pack would wrap all files in "bin", "sbin", and "libexec",
even non-executable files.  This would cause issues for git when its shell
scripts in libexec would try to source other shell files that had been
wrapped and were no longer a valid shell file.

I feel like a test should be added to tests/guix-pack-relocatable.sh, but
I'm not sure how to do that while keeping the test lightweight.  Suggestions
welcome.

Cheers,
`~Eric

* guix/scripts/pack.scm (wrapped-package)<build>: Build wrappers for
executable files and symlink others.

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