Qt4 - Open Dialog: Continue Capture tab, and implement the MRL updates. Slots and signals should be ok. Advanced Properties are not done (any volunteer ?), and Win32 are not done either.

Qt4 - open dialogs: Capture tab, DVB, PVR and V4L. main design is done. NEeds to be checked by people who actually use that kind of device.

 p = vlc.Position(value=16, origin=vlc.RelativePosition)
Defaults to value=0, origin=AbsolutePosition, key=MediaTime

* win32_specific.c, threads.c: fix win32 compilation.

* Some more fixes (+ don't redefine a function that already existed, reverts part of previous commit).

It is by design flawed to have phony built source.