[sql] Patch SQLite to allow control of close-time WAL checkpoint.

sql/connection.h

Index: sql/connection.h
diff --git a/sql/connection.h b/sql/connection.h
index 20ea3cd5101b199f20be8c143403bec9fd42f3dd..d17d1b032c42a8b417f781c0dcea7a16425bf28f 100644
--- a/sql/connection.h
+++ b/sql/connection.h
@@ -526,6 +526,7 @@ class SQL_EXPORT Connection {
   FRIEND_TEST_ALL_PREFIXES(SQLConnectionTest, GetAppropriateMmapSizeAltStatus);
   FRIEND_TEST_ALL_PREFIXES(SQLConnectionTest, OnMemoryDump);
   FRIEND_TEST_ALL_PREFIXES(SQLConnectionTest, RegisterIntentToUpload);
+  FRIEND_TEST_ALL_PREFIXES(SQLiteFeaturesTest, WALNoClose);
 
   // Internal initialize function used by both Init and InitInMemory. The file
   // name is always 8 bits since we want to use the 8-bit version of