Remove pointless set-once process pool userdata
Remove pointless set-once process pool userdata

I know some modules use this to detect if they're in the first or
second run of the post_config hook, but it's pointless to have if
there's no change in behavior.

airtower-luna/mod_gnutls,airtower-luna/mod_gnutls,airtower-luna/mod_gnutls