Fixing compiler issue due to nested classes not having friend status

src/database.h

@@ -90,6 +90,9 @@ public:
         sqlite3_int64 rowid;
     };
     
+    bool IsOpen() { return open; }
+    bool IsLocked() { return locked; }
+
     typedef Async<std::string, Database> AsyncTrace;
     typedef Async<ProfileInfo, Database> AsyncProfile;
     typedef Async<UpdateInfo, Database> AsyncUpdate;

src/statement.h

@@ -134,7 +134,7 @@ public:
         }
         virtual ~PrepareBaton() {
             stmt->Unref();
-            if (!db->open && db->locked) {
+            if (!db->IsOpen() && db->IsLocked()) {
                 // The database handle was closed before the statement could be
                 // prepared.
                 stmt->Finalize();