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
       "", ""
ef='/'><img src='https://git.koszko.org/cgit-static/cgit.png' alt='cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='3802d759dac5afd00bb378a128051f55a8363c53'/><select name='h' onchange='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=3802d759dac5afd00bb378a128051f55a8363c53'>refs</a><a class='active' href='/guix/log/gnu/packages/abiword.scm'>log</a><a href='/guix/tree/gnu/packages/abiword.scm?id=3802d759dac5afd00bb378a128051f55a8363c53'>tree</a><a href='/guix/commit/gnu/packages/abiword.scm?id=3802d759dac5afd00bb378a128051f55a8363c53'>commit</a><a href='/guix/diff/gnu/packages/abiword.scm?id=3802d759dac5afd00bb378a128051f55a8363c53'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/abiword.scm'>
<input type='hidden' name='id' value='3802d759dac5afd00bb378a128051f55a8363c53'/><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=3802d759dac5afd00bb378a128051f55a8363c53'>root</a>/<a href='/guix/log/gnu?id=3802d759dac5afd00bb378a128051f55a8363c53'>gnu</a>/<a href='/guix/log/gnu/packages?id=3802d759dac5afd00bb378a128051f55a8363c53'>packages</a>/<a href='/guix/log/gnu/packages/abiword.scm?id=3802d759dac5afd00bb378a128051f55a8363c53'>abiword.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/abiword.scm?id=3802d759dac5afd00bb378a128051f55a8363c53&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-02-08 23:51:13 +0100'>2019-02-08</span></td><td><a href='/guix/commit/gnu/packages/abiword.scm?id=7428d1693a281ee06e918310d95543da5349153e'>gnu: abiword: Don't use NAME in source URI.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-09 09:56:35 +0300'>2018-10-09</span></td><td><a href='/guix/commit/gnu/packages/abiword.scm?id=07b0662754014f7ac8ab81ce6a8878d0cc206b19'>gnu: abiword: Remove wmf support.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-04 15:43:46 +0100'>2018-03-04</span></td><td><a href='/guix/commit/gnu/packages/abiword.scm?id=692f6e457ee2eb9cdc9d95c3f8487155ecca81d4'>gnu: abiword: Disable duplicate icon cache generation.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2017-06-24 23:10:28 -0400'>2017-06-24</span></td><td><a href='/guix/commit/gnu/packages/abiword.scm?id=d17e085a59534a333cb8db028579fd0e6ec7f89b'>gnu: Remove libwmf.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>