MySQL 4.0 extended support ended on December 2008. More than 11 years later, I think it should now be safe to remove the specific support of MySQL versions < 4.1.
This entails (the list is not exhaustive):
Removal of the schema.pre-4.1.sql file
Adaptations in the HandelOutOfDateSchema method in incupdate.php
MySQL 4.0 extended support ended on December 2008. More than 11 years later, I think it should now be safe to remove the specific support of MySQL versions < 4.1.
This entails (the list is not exhaustive):
schema.pre-4.1.sqlfileHandelOutOfDateSchemamethod inincupdate.php