[flac-dev] Bug fix and compatibility patches for 1.3.0pre4

[Timothy B. Terriberry]

Robert Kausch wrote:
> MSDN says "The pos value is stored in an internal format and is intended
> for use only by *fgetpos* and *fsetpos*."
> (http://msdn.microsoft.com/en-us/library/70hdhh4t%28v=vs.80%29.aspx), so
> I don't think it's a good idea to use it this way even if tests
> suggested it works.

FWIW, I verified that this is the approach used by mingw32 to implement 
fseeko/ftello.