Ignore the new zonenow.tab file introduced in tzdata 2023d.

diff -u a/src/tz.cpp b/src/tz.cpp
--- a/src/tz.cpp	2024-03-08 11:14:14.822488065 +0100
+++ b/src/tz.cpp	2024-03-08 11:47:12.105268426 +0100
@@ -2667,6 +2667,7 @@
                 strcmp(d->d_name, "right")        == 0      ||
                 strcmp(d->d_name, "+VERSION")     == 0      ||
                 strcmp(d->d_name, "zone.tab")     == 0      ||
+                strcmp(d->d_name, "zonenow.tab")  == 0      ||
                 strcmp(d->d_name, "zone1970.tab") == 0      ||
                 strcmp(d->d_name, "tzdata.zi")    == 0      ||
                 strcmp(d->d_name, "leapseconds")  == 0      ||
0fc2baf172caa334b484c'/><select name='h' onchange='this.form.submit();'>
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<div class='path'>path: <a href='/guix/log/?id=d2509dbc64fa240183e0fc2baf172caa334b484c'>root</a>/<a href='/guix/log/etc?id=d2509dbc64fa240183e0fc2baf172caa334b484c'>etc</a>/<a href='/guix/log/etc/guix-publish.service.in?id=d2509dbc64fa240183e0fc2baf172caa334b484c'>guix-publish.service.in</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/etc/guix-publish.service.in?id=d2509dbc64fa240183e0fc2baf172caa334b484c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-03-11 14:34:25 -0700'>2024-03-11</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=5f100c68a4a8ef9ed5599bb99c910018869bc6f3'>etc: systemd services: switch to "journal" for output and error logging.</a><span class='msg-avail'>...<span class='msg-tooltip'>The "syslog" method has been deprecated for years, and issues a warning:

  Standard output type syslog is obsolete, automatically updating to
  journal. Please update your unit file, and consider removing the setting
  altogether.

Fixes: #48323

* etc/guix-daemon.service.in (StandardOutput): Use "journal"
(StandardError): Likewise.
* etc/guix-publish.service.in (StandardOutput): Likewise.
(StandardError): Likewise.
</span></span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2022-10-23 02:00:26 +0200'>2022-10-23</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=068f1a1905099f32beec9a8c4904efbb4c503981'>etc: systemd services shouldn't ‘RemainAfterExit’.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.service.in (RemainAfterExit): Don't.
* etc/guix-publish.service.in (RemainAfterExit): Likewise don't.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-10-23 02:00:25 +0200'>2022-10-23</span></td><td><a href='/guix/commit/etc/guix-publish.service.in?id=0f6ec662f626eb5ff0685a20ca7e153dae7442e6'>etc: Add ‘Restart=always’ to both systemd services.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.service.in (Restart): ‘Always’ do.
* etc/guix-publish.service.in (Restart): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>