BUG #4374: pg_restore does not restore public schema comment

The following bug has been logged online:

Bug reference:      4374
Logged by:          Daniel Migowski
Email address:      dmigowski@ikoffice.de
PostgreSQL version: 8.3.3
Operating system:   Windows
Description:        pg_restore does not restore public schema comment
Details:

Hello dear developers,

Currently a schema dump (custom format, containing the public schema
comment) can be restored, but the public schema version is not restored.

I assume you check if a schema already exists and the skip the schema part.
Please don't skip setting the comment, since we use it for versioning
purposes, and restoring from a dump breaks it.

With best regards,
Daniel Migowski