Add "make clean" target

[originally from svn r931]
2001-02-19 10:54:05 +00:00 · 2001-02-19 10:54:05 +00:00 · 83370ae6e5
--- a/doc/Makefile
+++ b/doc/Makefile
@ -9,3 +9,6 @@ Contents.html: $(INPUTS)
 	$(HOME)/src/buttress/build/buttress $(INPUTS)
 	rm -f index.html
 	ln -s Contents.html index.html
+
+clean:
+	rm -f *.html output.txt