disable the not anymore working parts, FAST_MATH needs to be fixed at some point...

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1740 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CSoftwareDriver2.cpp

@@ -526,7 +526,7 @@ const sVec4 CBurningVideoDriver::NDCPlane[6] =
 	core::setbit_cond( flag, (-v->Pos.y - v->Pos.w ) <= 0.f, 32 );
 
 */
-#ifdef _MSC_VER
+#ifdef IRRLICHT_FAST_MATH
 
 REALINLINE u32 CBurningVideoDriver::clipToFrustumTest ( const s4DVertex * v  ) const
 {