Add cl.exe path based architecture detection for CMake toolchain

[kumar8600]

In CMake use case, I want to use generators NMake Makefiles and Ninja for x64 architecture. But current auto architecture detection result is fixed to x86.

So I Add cl.exe path based architecture detection. This works well because the generators do same thing.

[msftclas]

Hi @kumar8600, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[ras0219-msft]

Thanks, this is an excellent improvement 👍

[kumar8600]

💯