Fix wamrc build error reported on Windows: ```bash CMake Error at CMakeLists.txt:84 (message): Unsupported CMAKE_HOST_SYSTEM_PROCESSOR AMD64 ``` And clear several compilation warnings.
Fix wamrc build error reported on Windows: ```bash CMake Error at CMakeLists.txt:84 (message): Unsupported CMAKE_HOST_SYSTEM_PROCESSOR AMD64 ``` And clear several compilation warnings.