add dep on sdf file

solenv/gbuild/Extension.mk

@@ -127,6 +127,7 @@ define gb_Extension_localize_properties
 ifneq ($(strip $(gb_WITH_LANG)),)
 $(call gb_Extension_get_target,$(1)) : FILES += $(2) $(foreach lang,$(subst -,_,$(gb_Extension_LANGS)),$(subst en_US,$(lang),$(2)))
 $(call gb_Extension_get_target,$(1)) : SDF2 := $(gb_Extension_SDFLOCATION)$(subst $(SRCDIR),,$(dir $(3)))localize.sdf
+$(call gb_Extension_get_target,$(1)) : $$(SDF2)
 $(call gb_Extension_get_target,$(1)) : $(call gb_Extension_get_workdir,$(1))/$(2)
 $(call gb_Extension_get_workdir,$(1))/$(2) : $(3)
 	$$(call gb_Output_announce,$(2),$(true),PRP,3)