If you look at the top of config.sub it says:

# Please send patches with a ChangeLog entry to config-patches@gnu.org.

# You can get the latest version of this script from:
# http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD

I do not know Python's policy on merging these types of patches, but most projects want the patch in the upstream repository from which they import.  They do not need to update to the latest, but at least backport the patch from config.sub HEAD instead of diverging and potentially losing the patch with the next update.

I do not see your patch there now. I'm surprised that it's not there already if needed for Fedora.