dix: use xorg_list saveSet list

[metux]

Simplify saveSet handling by just using trivial struct xorg_list instead of complicated dynamically resized array. Common operations like insert or remove are much simpler using lists instead of arrays.

Signed-off-by: Enrico Weigelt, metux IT consult [email protected]

[metux]

ups, xorg_list autoinit still insufficient, so need to be initialized explicitly