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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<tr><td><span title='2021-11-27 00:49:53 +0100'>2021-11-27</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=1b1f557d888fa84b1bc818f1b221776355a7a2dd'>daemon: Print the line whence we expect an integer.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/libstore/local-store.cc (LocalStore::getLineFromSubstituter):
Include the malformed substituter stream line in the error message.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-11-25 00:17:21 +0100'>2021-11-25</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=1eb40a6dc4917f5a2e915f8b31b750dba3d378c6'>daemon: Read unsigned nar size and download size from substituter.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/51983&gt;.
Reported by Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;.

* nix/libstore/local-store.cc (LocalStore::querySubstitutablePathInfos):
Expect 'unsigned long long' for 'downloadSize' and 'narSize'.
* tests/store.scm ("substitute query and large size"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>