Define unused variable in build_android_llm_demo.sh

Author: kirklandsign

build/build_android_llm_demo.sh

@@ -26,6 +26,14 @@ build_android_native_library() {
     EXECUTORCH_BUILD_QNN=OFF
   fi
 
+  NEURON_BUFFER_ALLOCATOR_LIB="${NEURON_BUFFER_ALLOCATOR_LIB:-}"
+  NEURON_USDK_ADAPTER_LIB="${NEURON_USDK_ADAPTER_LIB:-}"
+  if [ -n "$NEURON_BUFFER_ALLOCATOR_LIB" ]; then
+    EXECUTORCH_BUILD_NEURON=ON
+  else
+    EXECUTORCH_BUILD_NEURON=OFF
+  fi
+
   cmake . -DCMAKE_INSTALL_PREFIX="${CMAKE_OUT}" \
     -DCMAKE_TOOLCHAIN_FILE="${ANDROID_NDK}/build/cmake/android.toolchain.cmake" \
     -DANDROID_ABI="${ANDROID_ABI}" \