[Vorbis-dev] Patch to compile libvorbis on Windows x64

[Markus Ewald]

Hi!

I tried to do an x64 build of libvorbis but was stopped by the inline 
assembly in lib/os.h.

Attached is a patch that modifies this file so libvorbis will compile 
for Windows x64. Tested with Visual C++ 2008 Express (x86_x64 compiler 
from current Windows SDK; 15.00.21022.08), seems to be working fine with 
no other issues so far.

Important: As you can see in the patch, I also changed the default 
implementation for vorbis_ftoi() to do correct rounding with negative 
numbers. If this function is only used for positive numbers or the 
round-to-greater behavior was intentional, please remove that of my patch!

-Markus-

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