Honor SOURCE_DATE_EPOCH variable to avoid non-determinism in generated
"autoloads" files.

--- a/lisp/emacs-lisp/autoload.el
+++ b/lisp/emacs-lisp/autoload.el
@@ -378,8 +378,12 @@
   "Insert the section-header line,
 which lists the file name and which functions are in it, etc."
   (insert generate-autoload-section-header)
-  (prin1 `(autoloads ,autoloads ,load-name ,file ,time)
-	 outbuf)
+  (let* ((env  (getenv "SOURCE_DATE_EPOCH"))
+         (time (if env
+                   (seconds-to-time (string-to-number env))
+                 time)))
+    (prin1 `(autoloads ,autoloads ,load-name ,file ,time)
+           outbuf))
   (terpri outbuf)
   ;; Break that line at spaces, to avoid very long lines.
   ;; Make each sub-line into a comment.
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<tr><td><span title='2020-11-19 20:48:26 +0200'>2020-11-19</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=8ed4c468ab611409902c00bdf7c21fdb8d312928'>gnu: Don't append '.git' to GitHub uris.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-08-18 22:56:40 +0200'>2020-08-18</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=9068eb166d298ed23488be1b97001dd18fd0f3bb'>gnu: Add zxing-cpp.</a><span class='msg-avail'>...</span></td><td>Raghav Gururajan</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-18 22:23:51 +0300'>2020-04-18</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=cac674d99dc4a332e6210c57ec7f1b8164f66642'>gnu: qrcodegen-cpp: Update to 1.6.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>