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This removes needless differences between files compiled at different
times or by different people, or from sources in different locations.
Ref: http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00187.html

* lisp/emacs-lisp/bytecomp.el (byte-compile-insert-header):
No longer include timestamp etc information.

* etc/NEWS: Mention this.