* lisp/files-x.el: Use lexical-binding

3 jobs for master in 11 minutes and 49 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Fast
passed #16702
test-fast-inotify

00:08:48

 
  Normal
passed #16703
test-lisp-inotify

00:03:00

passed #16704
test-lisp-net-inotify

00:02:42