make faster mix parameters after repeat a vox because f0

CUDA/xfibres_gpu.cuh

@@ -71,6 +71,7 @@ void mix_params(	//INPUT
 			thrust::device_vector<double>   		params_repeat_gpu,
 			thrust::host_vector<int>			vox_repeat,
 			int						nrepeat,
+			int						nvox,
 			//INPUT-OUTPUT
 			thrust::device_vector<double>&   		params_gpu);