Copied from Debian.

From: Jérémy Bobbio <lunar@debian.org>
Subject: Remove build date
Bug-Debian: http://bugs.debian.org/782851
 In order to make unzip build reproducibly, we remove the
 (already optional) build date from the binary.

--- a/unix/unix.c
+++ b/unix/unix.c
@@ -1705,7 +1705,7 @@
 #endif /* Sun */
 #endif /* SGI */
 
-#ifdef __DATE__
+#if 0
       " on ", __DATE__
 #else
       "", ""
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<div class='path'>path: <a href='/guix/log/?id=5dd8cb2ec3488edd7fcd1371c188403cc28c7d42'>root</a>/<a href='/guix/log/gnu?id=5dd8cb2ec3488edd7fcd1371c188403cc28c7d42'>gnu</a>/<a href='/guix/log/gnu/packages?id=5dd8cb2ec3488edd7fcd1371c188403cc28c7d42'>packages</a>/<a href='/guix/log/gnu/packages/less.scm?id=5dd8cb2ec3488edd7fcd1371c188403cc28c7d42'>less.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/packages/less.scm?id=5dd8cb2ec3488edd7fcd1371c188403cc28c7d42&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-05 20:43:21 +0200'>2020-05-05</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=87a40d7203a813921b3ef0805c2b46c0026d6c31'>Merge branch 'master' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-05-04 23:08:02 +0200'>2020-05-04</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=0e680920b9e54d7c8a901b1c9cf02ce4468f44ed'>gnu: Add lesspipe.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (lesspipe): New variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Michael Rohleder</td></tr>
<tr><td><span title='2020-03-26 12:59:33 +0100'>2020-03-26</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=7baa8c78983424497f5db522243e9e396c99eb12'>gnu: less: Build fix for the Hurd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/less-hurd-path-max.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/less.scm (less): Use it.
</span></span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2019-12-03 01:52:45 +0100'>2019-12-03</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=6deab02c785abc5e89e37b9ccdab548bdf0cac1f'>gnu: less: Update to 551.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (less): Update to 551.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-12-03 01:52:44 +0100'>2019-12-03</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=4e94744dd9da1fde73328d810b8f7d92e12b7ca1'>gnu: less: Add upstream source URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (less)[source]: Add the author's site.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-20 19:54:25 +0100'>2018-02-20</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=130ea9e29bb920489222951774c1ff36d6fa89dd'>gnu: less: Update to 530.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (less): Update to 530.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-05-02 12:32:52 +0200'>2017-05-02</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=ebc4b6e0cf1b2031a10b0dac0b257afc037930d1'>gnu: less: Update to 487.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (less): Update to 487.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-10-21 18:00:59 +0200'>2015-10-21</span></td><td><a href='/guix/commit/gnu/packages/less.scm?id=ee53a14417753cbc18b72374cd16ba777fd2bfc7'>gnu: less: Update to 481.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/less.scm (less): Update to 481.
</span></span></td><td>Ludovic Courtès</td></tr>