Debian reproducible builds fail regarding mysql.sym.gz

Debian likes that builds are reproducible. We've already done many small fixes, but this nag still remains: Unsorted symbol list in ./usr/share/doc/mariadb-server-10.0/mysqld.sym.gz

See https://reproducible.debian.net/rb-pkg/unstable/amd64/mariadb-10.0.html and https://reproducible.debian.net/rb-pkg/unstable/amd64/mariadb-10.0.html

What could we do to get the symbols list sorted or in some other way to be identical from build to build?