* gnu/packages/databases.scm (mariadb): Update to 10.9.3.
[source](snippet): Remove adjustments for deprecated TokuDB.
[arguments]: Remove obsolete #:configure-flags. Build with system libfmt.
Adjust tests for 10.10.2, and mariadb_config file name. Remove patch phase.
[native-inputs]: Remove obsolete patch.
[inputs]: Add FMT. Change from OPENSSL-1.1 to OPENSSL.
* gnu/tests/databases.scm (%mysql-os): Adjust config file so MariaDB works on
overlayfs.