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Skip tests for older versions of SQLite

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Original file line number	Diff line number	Diff line change
`@@ -156,14 +156,21 @@ class ConnectionTests : SQLiteTestCase {`
`156`	`156`	`}`
`157`	`157`
`158`	`158`	`func test_transaction_rollsBackTransactionsIfCommitsFail() {`
	`159`	`+ let sqliteVersion = String(describing: try! db.scalar("SELECT sqlite_version()")!)`
	`160`	`+ .split(separator: ".").flatMap { Int(0ドル) }`
	`161`	`+ // PRAGMA defer_foreign_keys only supported in SQLite >= 3.8.0`
	`162`	`+ guard sqliteVersion[0] == 3 && sqliteVersion[1] >= 8 else {`
	`163`	`+ NSLog("skipping test for SQLite version \(sqliteVersion)")`
	`164`	`+ return`
	`165`	`+ }`
`159`	`166`	`// This test case needs to emulate an environment where the individual statements succeed, but committing the`
`160`	`167`	`// transaction fails. Using deferred foreign keys is one option to achieve this.`
`161`	`168`	`try! db.execute("PRAGMA foreign_keys = ON;")`
	`169`	`+ try! db.execute("PRAGMA defer_foreign_keys = ON;")`
`162`	`170`	`let stmt = try! db.prepare("INSERT INTO users (email, manager_id) VALUES (?, ?)", "alice@example.com", 100)`
`163`	`171`
`164`	`172`	`do {`
`165`	`173`	`try db.transaction {`
`166`		`- try db.execute("PRAGMA defer_foreign_keys = ON;")`
`167`	`174`	`try stmt.run()`
`168`	`175`	`}`
`169`	`176`	`XCTFail("expected error")`

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