Move win #define sleep out of #ifdef _MSC_VER

[rubensf]

sleep (with lowercase 's') is also not defined on MinGW GCC,
so we have to define it even when not using MSVC.

[sergiud]

I'm wondering why the CI did not catch this problem?

[rubensf]

Ah, this was my bad.

I'm using glog @ 96a2f23dca4cc7180821ca5f32e526314395d26a and with gn (instead of cmake), so there are no generated headers. Instead, the build caught src/windows/glog/logging.h which was removed in #625. That one has the #include unistd.h removed, so even though I tried -DHAVE_UNISTD_H, unistd.h wouldn't be included :/.

#if 0
# include <unistd.h>
#endif

Somehow I can't find the correct unistd.h in https://github.com/mirror/mingw-w64, but my code locally does find it :)

Thanks for the comment!