Comment 1 for bug 1850190

Thanks for this diff. I have that, plus these other changes, to consider:
https://paste.ubuntu.com/p/ZkDXsk9x7W/

The current ftbfs in focal is:
+ chmod go-rx /<<PKGBUILDDIR>>/mysql_db
+ chown mysql: /<<PKGBUILDDIR>>/mysql_db
+ mysql_install_db --no-defaults --user=mysql --datadir=/<<PKGBUILDDIR>>/mysql_db/data
debian/setup-mysql.sh: 47: mysql_install_db: not found
make[1]: *** [debian/rules:361: test-results.txt] Error 127