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vcvars32 surely will set x32

vcvars32 surely will set x32 environment.

To rebuild 64-bit libraw.dll I succesfully use this:

call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x64
nmake -f Makefiile.msvc

-- Alex Tutubalin @LibRaw LLC