Removed discarded compute versions

Author: Nikolai Tasev

CMakeLists.txt

@@ -24,10 +24,7 @@ if(CUDA_FOUND)
   -gencode;arch=compute_30,code=sm_30;  
   -gencode;arch=compute_35,code=sm_35;
   -gencode;arch=compute_35,code=compute_35;
-  -gencode;arch=compute_20,code=sm_20; 
-  -gencode;arch=compute_11,code=sm_11; 
-  -gencode;arch=compute_12,code=sm_12;
-  -gencode;arch=compute_13,code=sm_13;")
+  -gencode;arch=compute_20,code=sm_20;")
 
   # add -Wextra compiler flag for gcc compilations
   if (UNIX)