Include git revision in version number

This makes sure that it's easy to tell from the about box whether this is
a released version or a development build.

If it is compiled at the exact location of the tag, "git describe
--tags" will just return the tag-name. Otherwise it will return
something like this

    v2.1-393-ge03f31525aab

which means "v2.1 plus 393 commits, git SHA1 of tip is e03f31525aab",
which is a nice combination of git-readable (only the actual SHA1
matters) and human-readable (393 commits on top of v2.1).

And if you don't build from git sources, and don't have git installed,
it falls back on the old "v$(VERSION)" string.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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