python-linux-procfs: Makefile: Add ctags

Add the ability to use ctags to the Makefile. This adds the commands

make tags
make cleantags

and modifies
make clean

to call cleantags

Signed-off-by: John Kacur <jkacur@redhat.com>
diff --git a/Makefile b/Makefile
index ebca02d..b29f968 100644
--- a/Makefile
+++ b/Makefile
@@ -31,4 +31,12 @@
 pyclean:
 	@find . -type f \( -name \*~ -o -name \*.pyc \) -delete
 
-clean: pyclean rpmclean
+.PHONY: tags
+tags:
+	ctags -R --extra=+fq --python-kinds=+cfmvi
+
+.PHONY: cleantags
+cleantags:
+	rm -f tags
+
+clean: pyclean rpmclean cleantags