fix for msvc

[sdcg1994]

unistd.h is not used for msvc, it should be replaced with direct.h

[rsomla1]

Normally this file is not needed/used when building on Windows with msvc. However, it might become a problem if using msvc with clang or using ninja on Windows. I will investigate that.

[sdcg1994]

thx Get Outlook for Android<https://aka.ms/AAb9ysg>

…

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