[MPlayer-cygwin] [patch] add adapter selection to vo_directx (only vm)

[Rune]

This patch might of interest for people who use 2 or more adapters/monitors
like me.
With this patch you can now view movies on your secondary monitor.
I needed this when my DVD-player was in for repairs (not a KISS =)

The patch adds:
- directx 7 support (you will need v7 or higher now)
- adapter selection for vm mode
- some cleanup of vo_directx.c

To select an adapter:  -adapter <adapter number>

I woulden't mind some feedback
Rune