weston-launch: Run weston in the user login shell

This patch brings back the user environment from the shell.
In the future, weston-launch could create the Wayland socket earlier, in
which case the user's shell could be used to run Wayland-specific tools
in the new Weston session.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
1 file changed