make TAGS to work with bitkeeper

[Peter Chubb]

If you type, `make TAGS' in the top-level of a kernel tree that's been
created with bk clone (or if you're using sccs to maintain your own
copy), then the sccs control files are included in the TAGS file (sccs
distinguishes its control files with an s. prefix rather than using a
suffix, so the matches on '*.h' etc pick them up.)

diff -Nru a/Makefile b/Makefile
--- a/Makefile	Fri Apr 12 11:03:02 2002
+++ b/Makefile	Fri Apr 12 11:03:02 2002
@@ -347,9 +347,9 @@
 	$(MAKE) CFLAGS="$(CFLAGS) $(CFLAGS_KERNEL)" $(subst $@, _dir_$@, $@)
 
 TAGS: dummy
-	etags `find include/asm-$(ARCH) -name '*.h'`
-	find include -type d \( -name "asm-*" -o -name config \) -prune -o -name '*.h' -print | xargs etags -a
-	find $(SUBDIRS) init -name '*.[ch]' | xargs etags -a
+	{ find include/asm-${ARCH} -name '*.h' -print ; \
+	find include -type d \( -name "asm-*" -o -name config \) -prune -o -name '*.h' -print ; \
+	find $(SUBDIRS) init -name '*.[ch]' ; } | grep -v SCCS | etags -
 
 # Exuberant ctags works better with -I
 tags: dummy