Use _filelengthi64 instead of _fstat64 to calculate file size on x64 machines
Use _filelengthi64 instead of _fstat64 to calculate file size on x64 machines

For some reason, `_fstat64` fails with errno 22 on Windows Server 2003 x64 when compiled using the `v141_xp` toolset.
Using `_filelengthi64` instead solves this issue
hunter-packages/spdlog,hunter-packages/spdlog,hunter-packages/spdlog