Set up dependency of resource_export_package

The rules to build $(resource_export_package) need also the
framework-res's and potentially other shared libraries' package-export.apks.

Change-Id: I9ff10c621917ba7eed2da11a51cd2426845ad9be
diff --git a/core/package_internal.mk b/core/package_internal.mk
index ac0268f..4819a64 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -233,6 +233,7 @@
 
 $(proguard_options_file): $(R_file_stamp)
 
+resource_export_package :=
 ifdef LOCAL_EXPORT_PACKAGE_RESOURCES
 # Put this module's resources into a PRODUCT-agnositc package that
 # other packages can use to build their own PRODUCT-agnostic R.java (etc.)
@@ -296,7 +297,7 @@
     $(foreach lib,$(LOCAL_APK_LIBRARIES),\
         $(call intermediates-dir-for,APPS,$(lib),,COMMON)/src/R.stamp)
 
-$(R_file_stamp): $(all_library_res_package_export_deps)
+$(resource_export_package) $(R_file_stamp): $(all_library_res_package_export_deps)
 $(LOCAL_INTERMEDIATE_TARGETS): \
     PRIVATE_AAPT_INCLUDES := $(all_library_res_package_exports)
 endif # LOCAL_NO_STANDARD_LIBRARIES