libmnncore.so問題，解決思路

ninja: error: '../../../../libs/x86_64/libMNN.so', needed by '../../../../build/intermediates/cmake/debug/obj/x86_64/libmnncore.so', missing and no known rule to make it

    at com.android.build.gradle.internal.cxx.process.ProcessOutputJunction.execute(ProcessOutputJunction.kt:78)
    at com.android.build.gradle.internal.cxx.process.ProcessOutputJunction.execute(ProcessOutputJunction.kt:119)
    at com.android.build.gradle.tasks.ExternalNativeBuildTask.executeProcessBatch(ExternalNativeBuildTask.java:327)
    at com.android.build.gradle.tasks.ExternalNativeBuildTask.build(ExternalNativeBuildTask.java:195)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)

解決思路：

分析：

set_target_properties(
        MNN
        PROPERTIES IMPORTED_LOCATION
        ${lib_DIR}/${ANDROID_ABI}/libMNN.so
)