[omniORB] MinGW build fixes

[Duncan Grisby]

On Thursday 27 August, Sampo Ahokas wrote:

> Here's some minor patches to fix build on MinGW. Build with MSYS
> 1.0.11 / MinGW GCC 4.4.0 completes without errors using the patched
> tree (omniORB 4.1.4).

Thanks. I checked your patches in ages ago but forgot to mention it
here.

Cheers,

Duncan.

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