Use lexical-binding for some term libraries

This takes care of the most trivial cases, but there are more that
could be easily converted.

* lisp/term/bobcat.el:
* lisp/term/cygwin.el:
* lisp/term/konsole.el:
* lisp/term/linux.el:
* lisp/term/vt100.el:
* lisp/term/vt200.el: Use lexical-binding.

lisp/term/bobcat.el

@@ -1,3 +1,4 @@
+;;; bobcat.el  -*- lexical-binding:t -*-
 
 (defun terminal-init-bobcat ()
   "Terminal initialization function for bobcat."

lisp/term/cygwin.el

@@ -1,4 +1,4 @@
-;;; cygwin.el --- support for the Cygwin terminal
+;;; cygwin.el --- support for the Cygwin terminal  -*- lexical-binding:t -*-
 
 ;;; The Cygwin terminal can't really display underlines.
 

lisp/term/konsole.el

@@ -1,4 +1,4 @@
-;;; konsole.el --- terminal initialization for konsole
+;;; konsole.el --- terminal initialization for konsole  -*- lexical-binding:t -*-
 ;; Copyright (C) 2017-2020 Free Software Foundation, Inc.
 
 (require 'term/xterm)

lisp/term/linux.el

@@ -1,4 +1,4 @@
-;; The Linux console handles Latin-1 by default.
+;; The Linux console handles Latin-1 by default.  -*- lexical-binding:t -*-
 
 (declare-function gpm-mouse-enable "t-mouse" ())
 

lisp/term/vt100.el

@@ -1,4 +1,4 @@
-;;; vt100.el --- define VT100 function key sequences in function-key-map
+;;; vt100.el --- define VT100 function key sequences in function-key-map  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 1989, 1993, 2001-2020 Free Software Foundation, Inc.
 

lisp/term/vt200.el

@@ -1,3 +1,5 @@
+;;; vt200.el  -*- lexical-binding:t -*-
+
 ;; For our purposes we can treat the vt200 and vt100 almost alike.
 ;; Most differences are handled by the termcap entry.
 (defun terminal-init-vt200 ()