Fix SSE autodetection on Windows x64
Fix SSE autodetection on Windows x64

_M_IX86_FP is not defined for x64, but x64 always has SSE anyway.

scoopr/vectorial,jsanmiya/vectorial,scoopr/vectorial,malamanteau/vectorial,jsanmiya/vectorial,scoopr/vectorial,malamanteau/vectorial