ivf: Use _ftelli64 instead of ftello for MSVC
ftello isn't available on MSVC. On MinGW, both ftello and _ftelli64 are available. MinGW provides the _ftelli64 even on msvcrt versions that don't actually have such a function by providing a statically linked wrapper. But since the ftello function also is available (also provided as a similar wrapper), keep using that.
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