vlc.c: Attempt to kill VLC again if Ctrl-C is hit again when the abort timeout is ellapsed. It allows to abort VLC after the first abort timeout.

cmake: Add qt4 resources. Enable qt4 plugin compilation with cmake's CVS. (known not to work with cmake version 2.4-patch 7
)

Note that the format supported is the one created by FFmpeg, and not one of those described in the ticket.

note that a prebuilt table of preferred codecs, or even user interaction would be better