Makefile.in: fix Travis i686 build

by r65880

https://travis-ci.org/ruby/ruby/jobs/457384539

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65884 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Makefile.in

@@ -406,6 +406,7 @@ $(srcdir)/enc/jis/props.h: enc/jis/props.kwd
 
 .s.@OBJEXT@:
 	@$(ECHO) assembling $<
+	$(Q) $(MAKEDIRS) $(@D)
 	$(Q) $(CC) $(ASFLAGS) -o $@ -c $<
 
 .c.S: