- update to 9.6.19:
* CVE-2020-14350, bsc#1175194: Make contrib modules' installation
scripts more secure.
* https://www.postgresql.org/docs/9.6/release-9-6-19.html
- Remove postgresql-regress.patch, it does not apply anymore and
it does not seem to be needed anymore.
- Pack the /usr/lib/postgresql symlink only into the main package.

- Let postgresqlXX conflict with postgresql-noarch < 12.0.1 to get
a clean and complete cutover to the new packaging schema.

- Move from the "libs" build flavour to a "mini" package that will
only be used inside the build service and not get shipped, to
avoid confusion with the debuginfo packages (bsc#1148643).
- update to 9.6.17 (CVE-2020-1720, bsc#1163985)