BUG: fix sse test for msvc, gnu, clang
otbsiftfast was enabling /fp:fast option with msvc along with SSE. This is not normal as MSDN docs doesn't mention anything about /fp:fast when using /arch:SSE. I think it has a problematic behaviour with otb's dashboard testing. Many --compare-image tests we do are with zero tolerance. So it has to go.
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