bug#37562: 26.2; Obsolete vt-control and vt100-led

[Nicolas Semrau]

Five years ago, Stefan Monnier asked if vt100-led.el and vt-control.el

could be obsoleted.[1] Since there was no objection at the time (and

the hardware certainly not gaining in popularity since then), I propose

to go through with declaring /lisp/vt-control.el and /lisp/vt100-led.el

obsolete.

[1] https://lists.gnu.org/archive/html/emacs-devel/2014-05/msg00169.html