Update system.cmake

cmake/system.cmake

@@ -616,7 +616,7 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
   endforeach ()
 endif ()
 
-if (${F_COMPILER} STREQUAL "NAG" OR ${F_COMPILER} STREQUAL "CRAY" OR CMAKE_Fortran_COMPILER_ID STREQUAL "LLVMFlang")
+if (${F_COMPILER} STREQUAL "NAG" OR ${F_COMPILER} STREQUAL "CRAY" OR CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang")
   set(FILTER_FLAGS "-msse3;-mssse3;-msse4.1;-mavx;-mavx2,-mskylake-avx512")
   if (CMAKE_Fortran_COMPILER_ID STREQUAL "LLVMFlang")
     set(FILTER_FLAGS "${FILTER_FLAGS};-m32;-m64")