Enable SQLite column metadata

Build Unix SQLite with SQLITE_ENABLE_COLUMN_METADATA so the metadata APIs are available on macOS and Linux.

Remove the pdo_sqlite configure override that forced PHP to treat sqlite3_column_table_name() as unavailable, and add sanity checks for both SQLite compile options and PDO column metadata.

src/globals/ext-tests/pdo_sqlite.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+$pdo = new PDO('sqlite::memory:');
+$pdo->exec('CREATE TABLE spc_column_metadata_test (id INTEGER)');
+
+$stmt = $pdo->query('SELECT id FROM spc_column_metadata_test');
+if ($stmt === false) {
+    throw new RuntimeException('Failed to query SQLite metadata test table.');
+}
+
+$metadata = $stmt->getColumnMeta(0);
+if (($metadata['table'] ?? null) !== 'spc_column_metadata_test') {
+    throw new RuntimeException('PDO SQLite column metadata does not include the origin table.');
+}