bullet: Don't use sse in api for windows.

Remove stray BT_USE_SSE_IN_API definitions.
Was causing problems especially for 32 bit windows.

It's not quite clear why they were added in the first place since
this should be defined in btScalar.h, needs further investigation.

Thanks to Francisco De La Cruz (xercesblue) for looking into this.

Should fix [#35071] Bullet Convex Hull Crashes on Win32 with SSE

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56519 954f8c5b-7b00-dc11-b283-0030488c597c