Make PRISM_BUILD_DIR even when baseruby is available

It is needed before updating the timestamp for prism/srcs.mk.

Author: nobu

prism/srcs.mk

@@ -4,9 +4,8 @@ PRISM_CONFIG = $(PRISM_SRCDIR)/config.yml
 
 srcs uncommon.mk: prism/.srcs.mk.time
 
-prism/.srcs.mk.time:
+prism/.srcs.mk.time: $(order_only) $(PRISM_BUILD_DIR)/.time
 prism/$(HAVE_BASERUBY:no=.srcs.mk.time):
-	mkdir -p $(@D)
 	touch $@
 prism/$(HAVE_BASERUBY:yes=.srcs.mk.time): \
 		$(PRISM_SRCDIR)/templates/template.rb \

prism/srcs.mk.in

@@ -12,9 +12,8 @@ PRISM_CONFIG = $(PRISM_SRCDIR)/config.yml
 
 srcs <%=%><%=mk%>: prism/.srcs.mk.time
 
-prism/.srcs.mk.time:
+prism/.srcs.mk.time: $(order_only) $(PRISM_BUILD_DIR)/.time
 prism/$(HAVE_BASERUBY:no=.srcs.mk.time):
-	mkdir -p $(@D)
 	touch $@
 prism/$(HAVE_BASERUBY:yes=.srcs.mk.time): \
 		$(PRISM_SRCDIR)/templates/template.rb \