PostgreSQL: installation wizzard claims both the vendor specific and PDO driver are needed #367
Description
Using PostgreSQL as backend the installation wizzard claims that both the PDO driver ("pdo_pgsql") and the vendor specific driver ("pgsql") are needed. To my knowledge the two drivers are never used in parallel by a single PHP application so there seems to be something wrong either with the wizzard or the PostgreSQL backend itself.
If only pdo_pgsql is available the wizzard's initial page doesn't come up but an error message
If only pgsql is available the initial page does come up but after filing all credentials and clicking "Finish setup" there's
None of the two messages can be seen when both drivers are available.
Seen running 9.0.52 or 103417f on Arch Linux (PostgreSQL 9.5.3, PHP 7.0.8, Apache 2.4.23 using the PHP module).