Enable CL beta extensions for tests (KhronosGroup#322)

Signed-off-by: Ahmed Hesham <ahmed.hesham@arm.com>

Author: ahesham-arm

tests/CMakeLists.txt

@@ -93,6 +93,7 @@ endif()
 
 add_definitions(-DCL_TARGET_OPENCL_VERSION=300)
 add_definitions(-DCL_EXPERIMENTAL)
+add_definitions(-DCL_ENABLE_BETA_EXTENSIONS)
 
 add_definitions(-DUNITY_SUPPORT_64)
 if( CMAKE_SIZEOF_VOID_P EQUAL 8 )
@@ -190,4 +191,4 @@ if(TARGET OpenCL::OpenCL)
       endif()
     endforeach()
   endforeach()
-endif()
+endif()