When building with VC++ 2017 RC and its default header files the
intrin.h header file is less aggressively included by Windows headers.
This causes build breaks on Chrome x64 builds with VC++ 2017 RC when
X86MCTargetDesc.cpp uses __cpuid without first including its header.

https://github.com/google/swiftshader/pull/2

Change-Id: I664d7b509e0517b7621d41312ccdd0d3de60de84
Reviewed-on: https://swiftshader-review.googlesource.com/8951Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <capn@google.com>