src/flac/decode.c : Decoder buffering improvements on Windows.

On Windows, decoding flac files is also prone to producing fragmented
files. Avoid fragmentation on NTFS by using Windows specific functions to
tell Windows the size of the file beforehand.

Patch-from: Janne Hyvärinen <cse@sci.fi>
src/libFLAC/window.c : Add 'f' to float literals to avoid compiler warnings.

Patch-from: lvqcl <lvqcl.mail@gmail.com>