Port skipif.inc files to EXTENSIONS

Migrate more SKIPIF -> EXTENSIONS (#7139)

This is a mix of more automated and manual migration. It should remove all applicable extension_loaded() checks outside of skipif.inc files.

PDO MySQL: Use native types for results

Previously, PDO MySQL only fetched data as native int/float if
native prepared statements were used. This patch updates PDO to
have the same b

PDO MySQL: Use native types for results

Previously, PDO MySQL only fetched data as native int/float if
native prepared statements were used. This patch updates PDO to
have the same behavior for emulated prepared statements, and thus
removes the largest remaining discrepancy between these two modes.

Note that PDO already has a ATTR_STRINGIFY_FETCHES option to control
whether native types are desired or not. The previous output can
be restored by enabling this option.

Most of the tests make use of that option, because this allows the
tests to work under libmysqlclient as well, which currently always
returns string results (independently of whether native or emulated
PS are used).

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Handle column count change in PDO MySQL

This has been fixed for PDO SQlite by GH-4313, however the same
issue also applied to PDO MySQL.

Move the column count setting function i

Handle column count change in PDO MySQL

This has been fixed for PDO SQlite by GH-4313, however the same
issue also applied to PDO MySQL.

Move the column count setting function into the main PDO layer
(and export it) and then use it in both PDO SQLite and PDO MySQL.

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