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Chun-wei Fan authored
ntdef.h is a header that is normally only shipped with MinGW, not Visual Studio, which broke the build in commit 975cb910. Fix this by including winternl.h, which typedef's the NTSTATUS type in question on both Visual Studio and MinGW/mingw-w64, as well as pre-2008 Visual Studio. Clean up this inclusion part a little bit as well.
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