[ofw] [ib-diag] sminfo: add support for WinOF

[Sasha Khapyorsky]

On 10:46 Sat 14 Feb     , Sean Hefty wrote:
> 
> One advantage of using your approach is that the source files end up only
> including those headers that it needs.  Moving everything into ibdiag_osd.h
> means that the source files pick up other includes.  Anyway, just let me know
> your preference, and I'll update the patches.

I would prefer to have *nix/posix style files and to minimize the needed
changes in common sources.

Sasha