release.sh: use printf to create version files

Don't copy the files directly, because we might be doing
this from a work directory that has no files; in this case,
generic "unknown" variables are used, without generating
any files, so the current logic would produce an error.

However, we do need to create those dot files, because
we then rely on them for building release binaries.

The new logic maintains current behaviour, while fixing
this technical edge-case scenario via mitigation.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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