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.
nchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>refs</a><a class='active' href='/guix/log/gnu/packages/patches/highlight-gui-data-dir.patch'>log</a><a href='/guix/tree/gnu/packages/patches/highlight-gui-data-dir.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>tree</a><a href='/guix/commit/gnu/packages/patches/highlight-gui-data-dir.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>commit</a><a href='/guix/diff/gnu/packages/patches/highlight-gui-data-dir.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/highlight-gui-data-dir.patch'>
<input type='hidden' name='id' value='f59c31deaf44cf487878ae6e6b61026630b616ff'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>root</a>/<a href='/guix/log/gnu?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>gnu</a>/<a href='/guix/log/gnu/packages?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>patches</a>/<a href='/guix/log/gnu/packages/patches/highlight-gui-data-dir.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>highlight-gui-data-dir.patch</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/packages/patches/highlight-gui-data-dir.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-08-15 00:33:51 +0200'>2023-08-15</span></td><td><a href='/guix/commit/gnu/packages/patches/highlight-gui-data-dir.patch?id=820bf78cbc487d28457acc6cb790f4cbd7cc49b9'>gnu: highlight: Add "gui" output.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (highlight): Add gui output.
[source]: Add patch for GUI data directory.
[outputs]: Add gui.
[arguments]&lt;phases&gt;{fix-search-for-lua}: Fix Lua package name for GUI.
{build-gui}: Add phase to build GUI.
{install}: Set PREFIX variable.
{install-gui}: Add phase to install GUI.
[inputs]: Add qtbase-5.
* gnu/packages/patches/highlight-gui-data-dir.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>gemmaro</td></tr>