MariaDB Galera 26.4.24

MariaDB Galera release

synchronization of code changes with the ES version

MDEV-35108: galera rpm build error in Fedora 41

Changed to allow distributions like Fedora 41 to find
the galera-4.spec file - thanks to Daniel Black for proposed
fix.

Bump Galera version to 26.4.20

Merge pull request #19 from grooverdan/empty-os-release

build: empty /etc/os-release

Merge pull request #19 from grooverdan/empty-os-release

build: empty /etc/os-release

Bump Galera version to 26.4.19

Merge tag 'release_26.4.18' into galera-26.4.18

Merge tag 'release_26.4.18' into galera-26.4.18