[sql] Import SQLite 3.17.0.

third_party/sqlite/src/test/unixexcl.test

Index: third_party/sqlite/src/test/unixexcl.test
diff --git a/third_party/sqlite/src/test/unixexcl.test b/third_party/sqlite/src/test/unixexcl.test
index d6762178dd2eb90f2c27e8bd9e683c969a1a6cc5..8e9c4644d154f090dd804b4979cb6b7010a667a2 100644
--- a/third_party/sqlite/src/test/unixexcl.test
+++ b/third_party/sqlite/src/test/unixexcl.test
@@ -87,6 +87,7 @@ do_multiclient_test tn {
     sql1 {
       PRAGMA auto_vacuum = 0;
       PRAGMA journal_mode = WAL;
+      PRAGMA synchronous = FULL;
       CREATE TABLE t1(a, b);
       INSERT INTO t1 VALUES(1, 2);
     }