Litle patch for AMD64 on Windows

[szyk100]

Hi
I compiled succesfuly Omniorb and examples from https://github.com/liangqi/qt-omniorb . Main problem I encontered was that it is lack of _WIN64 clause in omnithread.h (__WIN32__ clause is not suitable when I compile with VS2015 AMD64 mode). So I added that clause and make litle patch which I attached to this email.

regards
Szyk Cech

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