MyRocks is not present in Ubuntu Artful

The release does not have MyRocks packages for Ubuntu Artful:

ftp://ftp.osuosl.org/pub/mariadb/mariadb-10.3.4/repo/ubuntu/pool/main/m/mariadb-10.3/
http://mirror.netcologne.de/mariadb/repo/10.2/ubuntu/pool/main/m/mariadb-10.2/

Reason found by dbart:

@elenst @spetrunia I think I see the issue, or at least, it's an issue that might explain it
debian/autobake-deb.sh and search for rocksdb
there's a line that converts the gcc version number to a "numberical" value
on xenial, for example, it takes gcc 5.4.0 and outputs 50400

on artful the version number is 7
the convoluted sed line outputs 7
that's less than 40800, so it takes rocksdb out of the debian/control file