[opus] opus_multistream_encode_float not working in libopus 1.1

[Alpha Thinktink]

> Have you tried compiling it yourself?

I just installed git for the first time and downloaded all of the
latest source code packages directly from the site.  I'm getting the
following every time I try to (re)build any of the projects:

1>------ Build started: Project: opus, Configuration: Release Win32 ------
1>  fatal: Not a git repository: 'C:\My Documents\Opus\win32\..\.git'
1>  The syntax of the command is incorrect.
1>  The system cannot find the path specified.
1>C:\Program Files\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(103,5):
error MSB3073: The command ""C:\My
Documents\Opus\win32\VS2010\..\..\win32\genversion.bat" "C:\My
Documents\Opus\win32\VS2010\..\..\win32\version.h" PACKAGE_VERSION
1>C:\Program Files\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(103,5):
error MSB3073: :VCEnd" exited with code 1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========