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Prefer the binary PACKAGED_VESION set by debian/rules to DEB_VERSION.
If unavailable, check for a .git development environments:
a. If run in our upstream repo `git describe` will gives a leading
XX.Y so return the --long version to allow daily build recipes
to count commit offset from upstream's XX.Y signed tag.
b. If run in a git-ubuntu pkg repo, upstream tags aren't visible,
believe __VERSION__ is correct - there is and MUST always be a
test to make sure it matches debian/changelog
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