core/install_jni_libs_internal.mk 中 my_embed_jni 如果这个没有这个变量就会清空my_jni_shared_libraries
!!!!!!!!!android系统编译的bug 这个判断是错误的,应该用 ifneq!!!!!!!!!!!!!!
ifeq ($(filter $(TARGET_OUT)/% $(TARGET_OUT_VENDOR)/% $(TARGET_OUT_OEM)/%, $(my_module_path)),)
# If this app isn't to be installed to system partitions.
my_embed_jni := true
endif