kbuild: fix false positive -dirty tag caused by make-kpkg

make-kpkg modifies scripts/package/Makefile and deletes
scripts/package/builddeb as part of its build process.  Ignore these
changes so the tree isn't marked as -dirty, when it is just an
artifact of make-kpkg.  (make-kpkg clean restores the files to their
original state, and these helper scripts won't affect the final
compiled kernel in any way.)

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index acce8eb..52f032e 100644
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -17,7 +17,8 @@
 
 	# Are there uncommitted changes?
 	git update-index --refresh --unmerged > /dev/null
-	if git diff-index HEAD | read dummy; then
+	if git diff-index --name-only HEAD | grep -v "^scripts/package" \
+	    | read dummy; then
 		printf '%s' -dirty
 	fi