Make export_includes depend on the module's definition makefile.

Bug: 6383397

Note that LOCAL_MODULE_MAKEFILE is calculated in the macro my-dir,
which must be called at the beginning of your Android.mk to calculate
 LOCAL_PATH.

Change-Id: I7aa079e37253fbda25ffb85c2e5bbf0663340e27
diff --git a/core/binary.mk b/core/binary.mk
index 70af9b9..04ac90b 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -692,7 +692,7 @@
 ###########################################################
 export_includes := $(intermediates)/export_includes
 $(export_includes): PRIVATE_EXPORT_C_INCLUDE_DIRS := $(LOCAL_EXPORT_C_INCLUDE_DIRS)
-$(export_includes) :
+$(export_includes) : $(LOCAL_MODULE_MAKEFILE)
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@
 ifdef LOCAL_EXPORT_C_INCLUDE_DIRS
diff --git a/core/definitions.mk b/core/definitions.mk
index 6bf3daa..9943d5f 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -113,11 +113,11 @@
 # Figure out where we are.
 define my-dir
 $(strip \
-  $(eval md_file_ := $$(lastword $$(MAKEFILE_LIST))) \
-  $(if $(filter $(CLEAR_VARS),$(md_file_)), \
+  $(eval LOCAL_MODULE_MAKEFILE := $$(lastword $$(MAKEFILE_LIST))) \
+  $(if $(filter $(CLEAR_VARS),$(LOCAL_MODULE_MAKEFILE)), \
     $(error LOCAL_PATH must be set before including $$(CLEAR_VARS)) \
    , \
-    $(patsubst %/,%,$(dir $(md_file_))) \
+    $(patsubst %/,%,$(dir $(LOCAL_MODULE_MAKEFILE))) \
    ) \
  )
 endef