CLSA-2026-1774028594 Update of postgresql11

Initial backport of PostgreSQL 11.22 for RHEL 7 - Based on Fedora/RHEL 8 spec files for PostgreSQL 10 and 12 - Adapted for RHEL 7 compatibility: - Disabled ICU support by default not readily available on RHEL 7 - Disabled plpython3 by default may need SCL for Python 3 - Removed perl-generators...