[Android] Strip .so for Release build (#6443)

ghstack-source-id: bd8ae69
Pull Request resolved: #6441

---------

Co-authored-by: Hansong Zhang <[email protected]>

Author: pytorchbot

build/build_android_llm_demo.sh

@@ -112,6 +112,9 @@ build_aar() {
   # Rename libexecutorch_jni.so to libexecutorch.so for soname consistency
   # between Java and JNI
   find jni -type f -name "libexecutorch_jni.so" -exec bash -c 'mv "$1" "${1/_jni/}"' bash {} \;
+  if [ "$EXECUTORCH_CMAKE_BUILD_TYPE" == "Release" ]; then
+    find jni -type f -name "*.so" -exec "$ANDROID_NDK"/toolchains/llvm/prebuilt/*/bin/llvm-strip {} \;
+  fi
   # Zip all necessary files into the AAR file
   zip -r executorch.aar libs jni/*/libexecutorch.so jni/*/libqnn*.so jni/*/libQnn*.so jni/*/libneuron_backend.so jni/*/libneuron_buffer_allocator.so jni/*/libneuronusdk_adapter.mtk.so AndroidManifest.xml
   popd