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=fcc39864dba82e14895afbe841091091366c96bc'>root</a>/<a href='/guix/log/gnu?id=fcc39864dba82e14895afbe841091091366c96bc'>gnu</a>/<a href='/guix/log/gnu/packages?id=fcc39864dba82e14895afbe841091091366c96bc'>packages</a>/<a href='/guix/log/gnu/packages/aux-files?id=fcc39864dba82e14895afbe841091091366c96bc'>aux-files</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre?id=fcc39864dba82e14895afbe841091091366c96bc'>linux-libre</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre/5.11-arm.conf?id=fcc39864dba82e14895afbe841091091366c96bc'>5.11-arm.conf</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/aux-files/linux-libre/5.11-arm.conf?id=fcc39864dba82e14895afbe841091091366c96bc&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-02-16 16:01:48 -0500'>2021-02-16</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/5.11-arm.conf?id=b819512ca2cce1051c5fea26328da2e5d6a9a101'>gnu: Add linux-libre 5.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/linux.scm (linux-libre-5.11-version, deblob-scripts-5.11,
linux-libre-5.11-pristine-source, linux-libre-5.11-source, linux-libre-5.11):
New variables.
* gnu/packages/aux-files/linux-libre/5.11-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.11-i686.conf,
gnu/packages/aux-files/linux-libre/5.11-arm.conf,
gnu/packages/aux-files/linux-libre/5.11-arm64.conf: New files.
* Makefile.am (AUX_FILES): Add them.
</span></span></td><td>Leo Famulari</td></tr>
s/telephony.scm?id=4bb9bb78c2482627b1afa2cffda68a4427a3b21d'>gnu: osip: Update to 5.2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/telephony.scm (osip): Update to 5.2.0.
</span></span></td><td>Léo Le Bouter</td></tr>
<tr><td><span title='2021-03-01 05:45:00 +0100'>2021-03-01</span></td><td><a href='/guix/commit/gnu/packages/telephony.scm?id=ea13b3a14cb079e33b59cf60cdabf500ecc51cf1'>gnu: mumble: Update to 1.3.4 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/telephony.scm (mumble): Update to 1.3.4.
[source]: Use GitHub releases as tarballs stopped being distributed through
'mumble.info'.
</span></span></td><td>Léo Le Bouter</td></tr>
<tr><td><span title='2021-02-18 15:51:01 +0100'>2021-02-18</span></td><td><a href='/guix/commit/gnu/packages/telephony.scm?id=26db713f0c6f0bcfae94167e2a66d8aececdc03b'>gnu: libtgvoip: Replace libopusenc with opus.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/telephony.scm (libtgvoip) [inputs]: Replace libopusenc with opus.

Signed-off-by: Leo Prikler &lt;leo.prikler@student.tugraz.at&gt;
</span></span></td><td>Raghav Gururajan</td></tr>
<tr><td><span title='2020-10-25 14:42:36 -0400'>2020-10-25</span></td><td><a href='/guix/commit/gnu/packages/telephony.scm?id=3c7ea674651d786960f084388f75da03d844a406'>gnu: mumble: Update to 1.3.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/telephony.scm (mumble): Update to 1.3.3.

Signed-off-by: Leo Famulari &lt;leo@famulari.name&gt;
</span></span></td><td>Michael Rohleder</td></tr>
<tr><td><span title='2020-09-02 10:48:38 +0300'>2020-09-02</span></td><td><a href='/guix/commit/gnu/packages/telephony.scm?id=2af2a76247de463452dfca9ca08ba206934b06cd'>gnu: osip: Update to 5.1.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/telephony.scm (osip): Update to 5.1.2.
</span></span></td><td>Efraim Flashner</td></tr>