add tflite example and fix bug

OpenAtomFoundation / TobudOS

开放原子开源基金会孵化的物联网操作系统，捐赠前为腾讯物联网终端操作系统TencentOS Tiny

https://cloud.tencent.com/product/tos-tiny

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Closed Derekduke closed 3 years ago

Derekduke commented 3 years ago

1.增加一个新的tflite demo，语音检测关键字的example工程 2.修复之前C调用C++的warning，之前依赖于keil编译器的自动识别，现在改用extern方式规范调用