databases/mariadb102-server: Update to 10.2.30

• Fix table compression [1]
• Fix link error in mariabackup [2]
• Fix GNUism [3]

PR: 239732 [1], 236101 [2], 240692 [3]
Submitted by: <iron udjin gmail com> [2], Mike Andrews <mandrews bit0 com> [3]
Reported by: Tao Zhou <zhoutao laocius org> [1]