[TASK] Update ADOdb to 5.18

Update ADOdb to current version 5.18 which fixes various bugs
and adds PHP 5.4 compatibility.

Resolves: #56761
Releases: 6.2
Change-Id: I5d46f52f8beb2407a40a3ee5796b00229b79992f
Reviewed-on: https://review.typo3.org/28253
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert