- Allows winbase.h to use inline intrinsics whether winnt.h is also included or not.
- Brings x86 versions of InterlockedAnd64 et al into alignment with MS.
- Adds the #ifdef for __MINGW_INTRIN_INLINE that jacek wanted for intrin-impl.h.


git-svn-id: svn://svn.code.sf.net/p/mingw-w64/code/trunk@5973 4407c894-4637-0410-b4f5-ada5f102cad1