Revise release mode build flags to even more aggressive in VS2010-VS2013.
Fix 64-bit build issues.
Fix 2013 build bat file.
Comment MSVC compiler flags.
Work around VS2013 x64 AVX codegen issue with Whole Program Optimizations enabled.
Add vs2013 x64 test batch file.
Work around Visual Studio AVX code generation bug. Fixes test mat4x4_transpose on VS2013 + x64 + AVX.