Ensure generated style headers are sorted

cmake/Modules/StyleHeaderUtils.cmake

@@ -48,8 +48,13 @@ function(CreateStyleHeader path filename)
     set(temp "")
     if(ARGC GREATER 2)
         list(REMOVE_AT ARGV 0 1)
+        set(header_list)
         foreach(FNAME ${ARGV})
             get_filename_component(FNAME ${FNAME} NAME)
+            list(APPEND header_list ${FNAME})
+        endforeach()
+        list(SORT header_list)
+        foreach(FNAME ${header_list})
             set(temp "${temp}#include \"${FNAME}\"\n")
         endforeach()
     endif()