The descriptions for fdo#53246 "Libo36 does not start, InvalidRegistryException
from program/services/postgresql-sdbc.rdb" make it look like the user had
installed the functionality that comes bundled in postgresql-sdbc.rdb also as an
extension installed per-user or shared.
<http://wiki.documentfoundation.org/PostgreSQL-SDBC> indicates that what is now
bundled due to c97d74b5 "fdo#45090: Changed
postgresql-sdbc from bundled oxt to proper optional part" indeed was once
available as a freestanding postgresql-sdbc-*.oxt that could have been installed
per-user or shared.

To prevent problems with such scenarios, rename the relevant implementation
names by adding a ".noext" suffix.

Change-Id: I43414a64461ba643f0ca0b2749450099cb6c8a4d