Cycles: tweak for AMD opencl compile of advanced shading, from Daniel Genrich,

still does not work correct but should compile if you have enough memory.

intern/cycles/device/device_opencl.cpp

@@ -301,7 +301,7 @@ public:
 		/* full shading only on NVIDIA cards at the moment */
 		if(platform_name == "NVIDIA CUDA")
 			build_options += "-D__KERNEL_SHADING__ -D__MULTI_CLOSURE__ -cl-nv-maxrregcount=24 -cl-nv-verbose ";
-		if(platform_name == "Apple")
+		if(platform_name == "Apple" || platform_name == "AMD Accelerated Parallel Processing")
 			build_options += " -D__CL_NO_FLOAT3__ ";
 
 		return build_options;