Skip the product-scoped --product flag if it's set in LOCAL_AAPT_FLAGS

Bug: 11335547
Change-Id: Ic08b7557a288508e8e8d14a725923960c47f5ca0
diff --git a/core/definitions.mk b/core/definitions.mk
index e1eb9f1..b35a6c3 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1649,7 +1649,7 @@
     $(addprefix -I , $(PRIVATE_AAPT_INCLUDES)) \
     $(addprefix --min-sdk-version , $(PRIVATE_DEFAULT_APP_TARGET_SDK)) \
     $(addprefix --target-sdk-version , $(PRIVATE_DEFAULT_APP_TARGET_SDK)) \
-    $(addprefix --product , $(TARGET_AAPT_CHARACTERISTICS)) \
+    $(if $(filter --product,$(PRIVATE_AAPT_FLAGS)),,$(addprefix --product , $(TARGET_AAPT_CHARACTERISTICS))) \
     $(if $(filter --version-code,$(PRIVATE_AAPT_FLAGS)),,$(addprefix --version-code , $(PLATFORM_SDK_VERSION))) \
     $(if $(filter --version-name,$(PRIVATE_AAPT_FLAGS)),,$(addprefix --version-name , $(PLATFORM_VERSION)-$(BUILD_NUMBER))) \
     $(addprefix --rename-manifest-package , $(PRIVATE_MANIFEST_PACKAGE_NAME)) \