Make the SDK compatible with LLVM Toolchain

24 Nov 2017

Hi ARMmbed developers,

I am using LLVM Toolchain to build mbed-os-example-wifi for REALTEK_RTL8195AM target, please review my patch https://github.com/ARMmbed/mbed-os/pull/5574 and give me some suggestion, thanks a lot!

Regards, Leslie Zhai