Make X_COLOR_DEPTH work even without a xorg.conf

X_COLOR_DEPTH in lts.conf is translated to `X -depth`, so it can be used
even without creating a xorg.conf file.

This is needed e.g. if someone wants to force 16 bit color depth for
speed reasons (saves almost 1/3 network bandwidth, some client CPU etc)
but doesn't want/need to create a xorg.conf.

A single line needs to be changed for this to work.
In /usr/share/ltsp/screen-session.d/XS95-colordepth,
  if [ "$X_CONF" = "$XCONF" ] && [ -n "$X_COLOR_DEPTH" ]; then
should become
  if [ -n "$X_COLOR_DEPTH" ]; then

Tested in vbox, seems to work fine.

Kind regards,
Alkis Georgopoulos


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