Use UTF-8 for rdoc-coverage and silence progress reporter

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -402,7 +402,7 @@ rdoc: PHONY main
 	$(Q) $(XRUBY) "$(srcdir)/bin/rdoc" --encoding=UTF-8 --no-force-update --all --ri --op "$(RDOCOUT)" $(RDOCFLAGS) "$(srcdir)"
 rdoc-coverage: PHONY main
 	@echo Generating RDoc coverage report
-	$(Q) $(XRUBY) "$(srcdir)/bin/rdoc" --all -C $(RDOCFLAGS) "$(srcdir)"
+	$(Q) $(XRUBY) "$(srcdir)/bin/rdoc" --encoding=UTF-8 --all --quiet -C $(RDOCFLAGS) "$(srcdir)"
 rdoc-coverage: PHONY main
 nodoc: PHONY