simplify docs Makefile

docs/zh_cn/Makefile

@@ -1,43 +1,2 @@
-# Makefile for Tux Paint docs
-# 
-# Uses "links" to convert docs from HTML to plain text.
-# (Normally only ran by the developers after updating the HTML, prior to
-# release.)
-#
-# Bill Kendrick
-# bill@newbreedsoftware.com
-# 
-# $Id$
-
-LINKS:=links -dump -no-numbering -no-references
-
-.PHONY: all
-all:	README.txt FAQ.txt
-# OPTIONS.txt
-# EXTENDING.txt
-# ADVANCED-STAMPS-HOWTO.txt
-
-.PHONY: clean
-clean:
-	-rm README.txt
-	-rm FAQ.txt
-#	-rm OPTIONS.txt
-#	-rm EXTENDING.txt
-#	-rm ADVANCED-STAMPS-HOWTO.txt
-
-README.txt:	html/README.html
-	$(LINKS) $< > $@
-
-OPTIONS.txt:	html/OPTIONS.html
-	$(LINKS) $< > $@
-
-FAQ.txt:	html/FAQ.html
-	$(LINKS) $< > $@
-
-EXTENDING.txt:	html/EXTENDING.html
-	$(LINKS) $< > $@
-
-ADVANCED-STAMPS-HOWTO.txt:	html/ADVANCED-STAMPS-HOWTO.html
-	$(LINKS) $< > $@
-
+include ../Makefile