Define TARGET_CPU_ABI for finding native code in .apks
diff --git a/core/Makefile b/core/Makefile
index fa0550c..110b3c9 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -131,6 +131,7 @@
 			TARGET_BOOTLOADER_BOARD_NAME="$(TARGET_BOOTLOADER_BOARD_NAME)" \
 			BUILD_FINGERPRINT="$(BUILD_FINGERPRINT)" \
 			TARGET_BOARD_PLATFORM="$(TARGET_BOARD_PLATFORM)" \
+			TARGET_CPU_ABI="$(TARGET_CPU_ABI)" \
 	        bash $(BUILDINFO_SH) > $@
 	$(hide) if [ -f $(TARGET_DEVICE_DIR)/system.prop ]; then \
 	          cat $(TARGET_DEVICE_DIR)/system.prop >> $@; \
diff --git a/core/main.mk b/core/main.mk
index 655a592..2bf8102 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -406,6 +406,10 @@
 
 # Clean up/verify variables defined by the board config file.
 TARGET_BOOTLOADER_BOARD_NAME := $(strip $(TARGET_BOOTLOADER_BOARD_NAME))
+TARGET_CPU_ABI := $(strip $(TARGET_CPU_ABI))
+ifeq ($(TARGET_CPU_ABI),)
+  $(error No TARGET_CPU_ABI defined by board config: $(board_config_mk))
+endif
 
 #
 # Include all of the makefiles in the system