kirkstone: 3f590faa108 prevents weston from starting under sysvinit

[andhe]

This commit is in the kirkstone branch:
3f590fa

When running sysvinit the above commit prevents weston from starting.

• /etc/init.d/weston will source /etc/profile (which sources /etc/profile.d/weston.sh)
• /etc/init.d/weston runs weston-start which checks if WAYLAND_DISPLAY is already set and if so bails out with:

ERROR: A Wayland compositor is already running, nested Weston instance is not supported yet.

PS. my system does not have a /run/wayland-0. The init script runs weston under weston user and the socket is in /run/user/$(id -u weston)/.