Android NDK PREBUILT_STATIC_LIBRARY LOCAL_SRC_FILE should only contain one item error

to include other modules in the project, in the module's Android.mk file

- using a shared (.so): PREBUILT_SHARED_LIBRARY 

- using a static (.a) library: PREBUILT_STATIC_LIBRARY

don't set LOCAL_SRC_FILES one item each

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := mobule_b
LOCAL_SRC_FILES := ./lib/module_a.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := module_b
LOCAL_SRC_FILES := ./lib/module_b.a
include $(PREBUILT_STATIC_LIBRARY)