[PATCH 0/2] MR4884: include/winnt.h against clang++.

[eric pouech (＠epo)]

Clang++ fails to compile Wine's include/winnt.h.
This is caused by Wine defining some function inline, while
the compiler provides an intrinsic version.
This is fine with a C compilation, but fails in a C++ compilation.

This serie fixes the compilation by better detecting the various
cases and giving favor to intrinsic when defined (on clang/clang++).