updated defintions to utilise openCL version number and not just check for 1.1...

updated defintions to utilise openCL version number and not just check for 1.1 or 1.2, but version number atleast 1.1
updated version number of API due to change.

CAAPIBaseVersion.txt

-120
+121

impls/square-cell/vn-neighbours/1-levels/opencl/caapi2D.cl

@@ -38,7 +38,9 @@ THE SOFTWARE.
 #pragma OPENCL EXTENSION cl_khr_fp64 : enable 
 #endif
 
-#if !(defined(CL_VERSION_1_1) || defined(CL_VERSION_1_2)) 
+//#if !(defined(CL_VERSION_1_1) || defined(CL_VERSION_1_2)) 
+#if !(defined(__OPENCL_C_VERSION__) && __OPENCL_C_VERSION__ >= 110) 
+
 #error "At least openCL version 1.1 needed".
 #endif