CONFIG_LOCALVERSION_AUTO

This will try to automatically determine if the current tree is a
release tree by looking for git tags that belong to the current
top of tree revision.

A string of the format -gxxxxxxxx will be added to the localversion
if a git-based tree is found.  The string generated by this will be
appended after any matching localversion* files, and after the value
set in CONFIG_LOCALVERSION.

(The actual string used here is the first eight characters produced
by running the command:

  $ git rev-parse --verify HEAD

which is done within the script "scripts/setlocalversion".)

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