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      ||
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<tr><td><span title='2020-04-16 23:41:52 +0200'>2020-04-16</span></td><td><a href='/guix/commit/doc/package-hello.json?id=c9f321e52a99dea93fcc099372ea0167150b9aac'>doc: Document building and installing from JSON files.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Invoking guix package): Augment pargraphs for
"--install-from-file".
(Invoking guix build): Document building from JSON files.
* doc/package-hello.json: New file.
* doc/local.mk (EXTRA_DIST): Add it.
</span></span></td><td>Ricardo Wurmus</td></tr>