add OpenCV 2.2 xml haarcascade files used of libface

This way we fix a lots of case where xml files are not present :

OpenCV data files are installed by a separated package in linux, and can be missing in target system.
OpenCV data files are not installed by OpenCV project under Windows.
If application is relecated as for ex with windows intaller, as xml path is written at compilation time, at run time, they cannot be found.

BUGS: 262212