Comment out SVM fresnel_conductor() function for now, still unused.

intern/cycles/kernel/closure/bsdf_util.h

@@ -111,6 +111,7 @@ ccl_device float fresnel_dielectric_cos(float cosi, float eta)
 	return 1.0f; // TIR(no refracted component)
 }
 
+#if 0
 ccl_device float3 fresnel_conductor(float cosi, const float3 eta, const float3 k)
 {
 	float3 cosi2 = make_float3(cosi*cosi);
@@ -123,6 +124,7 @@ ccl_device float3 fresnel_conductor(float cosi, const float3 eta, const float3 k
 					(tmp_f + (2.0f * eta * cosi) + cosi2);
 	return(Rparl2 + Rperp2) * 0.5f;
 }
+#endif
 
 ccl_device float smooth_step(float edge0, float edge1, float x)
 {