fix windows EOF check

[kyle-sylvestre]

windows_file_read is checking EOF using the asynchronous method instead of the synchronous method.
https://learn.microsoft.com/en-us/windows/win32/fileio/testing-for-the-end-of-a-file

[slouken]

Merged, thanks!

[icculus]

Hmm, I wonder if this will fix the Windows-only loader bug in SDL3_mixer...

[kyle-sylvestre]

If it's WAV related then yes. My WAV's stopped playing after I updated SDL and I tracked it down to this block in decoder_wav.c:

        if (!SDL_ReadU32LE(io, &chunk_type) || !SDL_ReadU32LE(io, &chunk_length)) {
            if (SDL_GetIOStatus(io) == SDL_IO_STATUS_EOF) {
                break;
            }
            return false;
        }