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
@@ -419,8 +419,12 @@
   ;;              nil t))
   ;;        (match-end 2))))
   (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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<div class='path'>path: <a href='/guix/log/?id=ad9e007e620d4274ac9e41b806bab86c66dfd734'>root</a>/<a href='/guix/log/gnu?id=ad9e007e620d4274ac9e41b806bab86c66dfd734'>gnu</a>/<a href='/guix/log/gnu/services?id=ad9e007e620d4274ac9e41b806bab86c66dfd734'>services</a>/<a href='/guix/log/gnu/services/messaging.scm?id=ad9e007e620d4274ac9e41b806bab86c66dfd734'>messaging.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/messaging.scm?id=ad9e007e620d4274ac9e41b806bab86c66dfd734&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-13 23:12:43 +0100'>2019-03-13</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=59e80445882f8b0379e54916f89510c0deda6698'>Remove traces of "GuixSD".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-10 14:59:23 +0100'>2019-01-10</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=65a67bf711b14bc7200f6730c0f173375ca12974'>services: Use 'define-deprecated' for service procedures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-24 11:18:36 +0200'>2018-12-24</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=dcad57d5fca43a111e1b314264171c80d4d9a75b'>services: Add quassel.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-08-13 18:11:02 +0200'>2018-08-13</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=fdbca05d78d091bfc075e54c9fb90125262eadf0'>services: prosody: Get the Shepherd to respawn Prosody.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-08-13 18:10:58 +0200'>2018-08-13</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=2ded865665850d9f257ee62a995658c1381a8f4a'>services: prosody: Use 'invoke' rather than 'system*'.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-05-11 00:15:59 +0200'>2018-05-11</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=36d619e85d29d1fb2e4a36406c8bc6f999484f07'>services: bitlbee: Add plugins.</a><span class='msg-avail'>...</span></td><td>Pierre-Antoine Rouby</td></tr>
<tr><td><span title='2018-05-01 00:25:31 +0200'>2018-05-01</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=cb7c80f67de656025dee60785fb4b45ce2d7dacd'>services: prosody: Add a default value to the prosody-service-type.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-05-01 00:25:26 +0200'>2018-05-01</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=9c6a461cf0512b8f43f83837907f35cf2255077e'>services: prosody: Add a description to the prosody-service-type.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-03-03 18:21:52 +0100'>2018-03-03</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=bdcf0e6fd484a54240a98ddf8b6fa433c1b9bd6c'>services: messaging: Prosody config supports file-like objects.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-01-15 23:29:33 +0100'>2018-01-15</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=37af37dcc9a5d4fbb16540d5972fd5333043b413'>doc: Deprecate 'bitlbee-service' procedure.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-15 23:29:33 +0100'>2018-01-15</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=f2bee4210ff7da38696d8e49999282e27b4a6364'>services: bitlbee: Move to (gnu services messaging).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-12-24 16:12:12 +0100'>2017-12-24</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=7459cb9305ff8ae7e72ca29aad0f8f8e1e807641'>services: messaging: Use HTTPS for prosody.im URLs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>