kbuild: change CONFIG_LOCALVERSION_AUTO to use a git-describe-ish format

Change the automatic local version to have the form -nnnnn-gSHA1SUMID,
where 'nnnnn' is the number of commits since the last tag (i.e.,
2.6.21-rc7).  This makes it much more likely that the package names created
for the kernel will look "newer" to a package manager.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/setlocalversion

@@ -12,7 +12,7 @@ cd "${1:-.}" || usage
 if head=`git rev-parse --verify HEAD 2>/dev/null`; then
 	# Do we have an untagged version?
 	if git name-rev --tags HEAD | grep -E '^HEAD[[:space:]]+(.*~[0-9]*|undefined)$' > /dev/null; then
-		printf '%s%s' -g `echo "$head" | cut -c1-8`
+	        git describe | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
 	fi
 
 	# Are there uncommitted changes?