Fix compilation of cycles for MinGW-w64 after recent commits. MinGW-w64 has conflicting redefinitions of the SSE functions in windows.h, so we will be using this header instead, since we can't always avoid including it instead of the sse headers.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57298 954f8c5b-7b00-dc11-b283-0030488c597c