Remove duplicate entries in EXTENSIONS

These would cause failures if the extensions is loaded dynamically.

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.

Mark slow tests

Each of these tests took more than ten seconds on a recent AppVeyor CI
run; that appears to qualify them to be marked as slow tests.

Closes GH-7077.

Fix bug #79375

Make sure deadlock errors are properly propagated and reports in
a number of places in mysqli and PDO MySQL.

This also fixes a memory and a segfault that can occu

Fix bug #79375

Make sure deadlock errors are properly propagated and reports in
a number of places in mysqli and PDO MySQL.

This also fixes a memory and a segfault that can occur under these
conditions.

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