[Fix] Another effort to unbreak sqlite locking

src/libutil/sqlite_utils.c

 	}
 
 	if (create && has_lock) {
-		if (sqlite3_exec (sqlite, sqlite_wal, NULL, NULL, NULL) != SQLITE_OK) {
+		while ((rc = sqlite3_exec (sqlite, sqlite_wal, NULL, NULL, NULL)) != SQLITE_OK) {
+			if (rc == SQLITE_BUSY) {
+				struct timespec sleep_ts = {
+						.tv_sec = 0,
+						.tv_nsec = 1000000
+				};
+
+				nanosleep (&sleep_ts, NULL);
+
+				continue;
+			}
+
 			msg_warn_pool_check ("WAL mode is not supported (%s), locking issues might occur",
 					sqlite3_errmsg (sqlite));
+			break;
 		}
 
 		if (sqlite3_exec (sqlite, exclusive_lock_sql, NULL, NULL, NULL) != SQLITE_OK) {