SDK atree: support HOST_OUT location.

Change-Id: Ib369280971b37a3eb35ac94991cdbc49dead903e
diff --git a/core/Makefile b/core/Makefile
index 71140fd..0074f39 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1437,6 +1437,7 @@
 			-I $(TARGET_COMMON_OUT_ROOT) \
 			-v "PLATFORM_NAME=android-$(PLATFORM_VERSION)" \
 			-v "OUT_DIR=$(OUT_DIR)" \
+			-v "HOST_OUT=$(HOST_OUT)" \
 			-v "TARGET_ARCH=$(TARGET_ARCH)" \
 			-v "TARGET_CPU_ABI=$(TARGET_CPU_ABI)" \
 			-v "DLL_EXTENSION=$(HOST_SHLIB_SUFFIX)" \