Update FIRMessagingRmqManager.m

firebase#12900

Testing
I ran test locally

Author: doganaltinbas

FirebaseMessaging/Sources/FIRMessagingRmqManager.m

@@ -490,9 +490,11 @@ - (void)openDatabase {
     BOOL didOpenDatabase = YES;
     if (![fileManager fileExistsAtPath:path]) {
       // We've to separate between different versions here because of backwards compatbility issues.
-      int result = sqlite3_open_v2(
-          [path UTF8String], &self -> _database,
-          SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FILEPROTECTION_NONE, NULL);
+        int flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE;
+#ifdef SQLITE_OPEN_FILEPROTECTION_NONE
+        flags |= SQLITE_OPEN_FILEPROTECTION_NONE;
+#endif
+        int result = sqlite3_open_v2([path UTF8String], &self -> _database, flags, NULL);
       if (result != SQLITE_OK) {
         NSString *errorString = FIRMessagingStringFromSQLiteResult(result);
         NSString *errorMessage = [NSString