debian: 99-enable-encryption.cnf.preset file, not symlink

Prevents errors on Windows Linux subsystem.

Fix to pr #1600

debian/additions/mariadb.conf.d/99-enable-encryption.cnf.preset

-../../../support-files/rpm/enable_encryption.preset
\ No newline at end of file

debian/mariadb-server-10.5.install

@@ -3,6 +3,7 @@ debian/additions/debian-start.inc.sh usr/share/mysql
 debian/additions/echo_stderr usr/share/mysql
 debian/additions/mariadb.conf.d/50-mysqld_safe.cnf etc/mysql/mariadb.conf.d
 debian/additions/mariadb.conf.d/50-server.cnf etc/mysql/mariadb.conf.d
+support-files/rpm/enable_encryption.preset etc/mysql/mariadb.conf.d/99-enable-encryption.cnf.preset
 debian/additions/source_mariadb-10.5.py usr/share/apport/package-hooks
 etc/apparmor.d/usr.sbin.mariadbd
 etc/security/user_map.conf