Default LOCAL_SDK_RES_VERSION to LOCAL_SDK_VERSION

in static_java_library.mk.

Change-Id: I25ad47fea0fdb10c8aa0a0cb0d4c5ed117cd76ef
diff --git a/core/static_java_library.mk b/core/static_java_library.mk
index d317691..0b2f63b 100644
--- a/core/static_java_library.mk
+++ b/core/static_java_library.mk
@@ -53,6 +53,11 @@
 endif
 full_android_manifest := $(LOCAL_PATH)/$(LOCAL_MANIFEST_FILE)
 
+LOCAL_SDK_RES_VERSION:=$(strip $(LOCAL_SDK_RES_VERSION))
+ifeq ($(LOCAL_SDK_RES_VERSION),)
+  LOCAL_SDK_RES_VERSION:=$(LOCAL_SDK_VERSION)
+endif
+
 framework_res_package_export :=
 framework_res_package_export_deps :=
 # Please refer to package.mk