This adds LXDE.

One application, possibly[*] lxsession or lxpanel, has a mistake[1], the
rest is supposedly functional, builds without obvious mistakes.
Some can be used independent from the bigger picture LXDE desktop, like
it was designed by LXDE project.

I appreciate ideas how or even people taking initiative to fix the mistake
in the way for an functional LXDE desktop.

*: possibly, from memory at least 5+ weeks since I've debugged this
1: in execution/running, not the build