common.mk: timestamp directory

* common.mk: timestamp files need the timestamp directory.
  [Bug #15015] [ruby-core:88584]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64491 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -212,7 +212,8 @@ mjit_config.h: Makefile
 
 # Other `-Dxxx`s preceding `-DMJIT_HEADER` will be removed in transform_mjit_header.rb.
 # So `-DMJIT_HEADER` should be passed first when rb_mjit_header.h is generated.
-$(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time: probes.h vm.$(OBJEXT)
+$(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time: probes.h vm.$(OBJEXT) \
+		$(TIMESTAMPDIR)/$(arch)/.time
 	$(ECHO) building $(@F:.time=.h)
 	$(Q) $(CPP) -DMJIT_HEADER $(MJIT_HEADER_FLAGS) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(srcdir)/vm.c $(CPPOUTFLAG)$(@F:.time=.h).new
 	$(Q) $(IFCHANGE) "--timestamp=$@" $(@F:.time=.h) $(@F:.time=.h).new