Update system.cmake

Author: martin-frbg

cmake/system.cmake

@@ -55,7 +55,7 @@ if (DEFINED TARGET)
         endif()
 #    elseif (${CMAKE_C_COMPILER_ID} STREQUAL "CLANG")
 #      set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
-    endif()    
+#    endif()    
   endif()
   if (${TARGET} STREQUAL "SKYLAKEX" AND NOT NO_AVX512)
     set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")