[RESEND] [d3d] Light management API fix to handle an unlimited number of lights

[Antoine Chavasse]

Resend of http://www.winehq.org/hypermail/wine-patches/2005/06/0103.html,
adapted to Christian's reorganisation of ddraw directory, and as
attachment to avoid gmail word-wrapping the patch :)

ChangeLog:
 - Rewrote the light management API to allow for an unlimited amount
of lights to be set, and only a subset of them to be enabled.