Restore -msse3

Author: martin-frbg

cmake/system.cmake

@@ -70,6 +70,9 @@ if (DEFINED TARGET)
       set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
     endif()
   endif()
+  if (DEFINED HAVE_SSE3)
+    set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -msse3")
+  endif()
 endif()
 
 if (DEFINED TARGET)