Disable lexical-binding in ediff

Since it breaks the thing (bug#36157, bug#36281).
* lisp/vc/ediff-diff.el, lisp/vc/ediff-help.el, lisp/vc/ediff-hook.el:
* lisp/vc/ediff-init.el, lisp/vc/ediff-merg.el, lisp/vc/ediff-mult.el:
* lisp/vc/ediff-ptch.el, lisp/vc/ediff-vers.el, lisp/vc/ediff-wind.el:
* lisp/vc/ediff.el: Set lexical-binding to nil.
1 job for master in 51 minutes and 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #2272
test-all

00:51:43

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:318: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:957: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1