[css2] Added a rule to create a missing chapter, in case the new version has

more chapters than the old one.

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402250

Author: bert-github

css2/diffs-rec/Makefile

@@ -1,2 +1,5 @@
 %.html: ../%.html $(PREV)/%.html
 	-$(HTMLDIFF) $(PREV)/$@ ../$@ >$@
+
+$(PREV)/%.html:
+	touch $@