else, it is equivalent to strdup(). So, we will check if the substitution
tables are trivial at the load time, and possibly save 2 calls to
__collate_substitute() in strcoll().
Still, __collate_substitute() should not exist.
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
