Mandelbulber

This patch is intended to fix the following errors seen for the opencl build

OpenCL Build log: "S:\TEMP\OCL4008T5.cl", line 427: error: invalid combination of type specifiers
float3 half = input->lightVect - input->viewVector;
^

"S:\TEMP\OCL4008T5.cl", line 427: error: expected an identifier
float3 half = input->lightVect - input->viewVector;
^

"S:\TEMP\OCL4008T5.cl", line 428: error: expected an identifier
half = normalize(half);
^

"S:\TEMP\OCL4008T5.cl", line 428: error: direct use of type "half" requires
OpenCL extension cl_khr_f16 (not supported)
half = normalize(half);
^

"S:\TEMP\OCL4008T5.cl", line 428: error: expected an expression
half = normalize(half);
^

"S:\TEMP\OCL4008T5.cl", line 429: error: expected an expression
float shade2 = dot(input->normal,half);
^