[php-src] Issue #8419: make test fail while pdo_sqlite build

Issue: https://github.com/php/php-src/issues/8419 Comment Author: cmb69 > 'TESTS' => __DIR__ . > '/../../ext/pdo/tests' This fix would break regular builds (in-tree builds using buildconf). It would also not help with general phpize builds (there is usually no need to build from within the php-src tree). I think that we should consider to adjust [run-tests.php](https://github.com/php/php-src/blob/master/run-tests.php) to cater to both regular and in-tree phpize builds (i.e. check which of the two possible file exists). It should be noted that 5ba763413b8f1e0e2399f124641845cf782ce0f5 introduced the __DIR__ to have absolute paths (previously, we had relative paths, which would make it trivial to check for file existance in different locations).