It's likely that there is no fix, other than using the native driver (mysqlnd). If the PHP extension was compiled against a specific libmysql version (e.g. the one that's bundled with PHP), then simply swapping in a newer version likely won't work since the extension will be looking for exports that might have changed/been removed from the newer library.
In other words, you'll likely have to either go with option a) above or option c) ignore the message(s). :p
