win32/Makefile.sub: fix typo, missing comma

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62366 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/Makefile.sub

@@ -1258,7 +1258,7 @@ mjit_config.h:
 	@echo /* MJIT_CFLAGS */>> $@
 	@
 	@(set sep=#define MJIT_OPTFLAGS ) & \
-	for %I in ($(OPTFLAGS)) do @(call echo.%%sep%%"%%~I" \& set sep= ) >> $@
+	for %I in ($(OPTFLAGS)) do @(call echo.%%sep%%"%%~I", \& set sep= ) >> $@
 	@echo /* MJIT_OPTFLAGS */>> $@
 	@
 	@(set sep=#define MJIT_DEBUGFLAGS ) & \