single instance: Avoid initializing twice because of dbus activation
The single instance mode currently tries to contact another VLC instance
through dbus in order to find out if one is running. With dbus activation,
it results to the dbus daemon launching a new VLC instance while the
first one blocks until the new one answers the call
This patch uses org.freedesktop.DBus.NameHasOwner instead in order to get
an answer from the dbus daemon without it launching a second instance.
projects / vlc / commit