Skip Thai character test when libthai is unavailable.

Taken from upstream bug tracker:
https://gitlab.gnome.org/GNOME/pango/merge_requests/161
https://gitlab.gnome.org/GNOME/pango/commit/b73284747ac937e31dc9191f84ed6e24284c88ee

diff --git a/tests/test-break.c b/tests/test-break.c
index 8549b678bba69360d07dce3af21d915412f20d51..47fa3009165e19a331aa04a0df4351ae2323933b 100644
--- a/tests/test-break.c
+++ b/tests/test-break.c
@@ -305,6 +305,12 @@ main (int argc, char *argv[])
       if (!strstr (name, "break"))
         continue;
 
+#ifndef HAVE_LIBTHAI
+      /* four.break involves Thai, so only test it when we have libthai */
+      if (strstr (name, "four.break"))
+        continue;
+#endif
+
       path = g_strdup_printf ("/break/%s", name);
       g_test_add_data_func_full (path, g_test_build_filename (G_TEST_DIST, "breaks", name, NULL),
                                  test_break, g_free);
</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=a1f9eba892784069e34338e01237a74b8a3bd8a2'>refs</a><a class='active' href='/guix/log/etc/guix-publish.service.in'>log</a><a href='/guix/tree/etc/guix-publish.service.in?id=a1f9eba892784069e34338e01237a74b8a3bd8a2'>tree</a><a href='/guix/commit/etc/guix-publish.service.in?id=a1f9eba892784069e34338e01237a74b8a3bd8a2'>commit</a><a href='/guix/diff/etc/guix-publish.service.in?id=a1f9eba892784069e34338e01237a74b8a3bd8a2'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/guix-publish.service.in'>
<input type='hidden' name='id' value='a1f9eba892784069e34338e01237a74b8a3bd8a2'/><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=a1f9eba892784069e34338e01237a74b8a3bd8a2'>root</a>/<a href='/guix/log/etc?id=a1f9eba892784069e34338e01237a74b8a3bd8a2'>etc</a>/<a href='/guix/log/etc/guix-publish.service.in?id=a1f9eba892784069e34338e01237a74b8a3bd8a2'>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=a1f9eba892784069e34338e01237a74b8a3bd8a2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></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>
17</span></td><td><a href='/guix/commit/nix/nix-daemon?id=bc3896db25c788c181c7bcd65754e7cd378e9d9f'>daemon: Correctly handle '--discover' with no value.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, we'd get:

  $ guix-daemon --discover
  error: basic_string::_M_construct null not valid

* nix/nix-daemon/guix-daemon.cc (parse_opt): Change second argument to
'settings.set' to properly handle case where ARG is NULL.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-29 15:08:26 +0100'>2020-11-29</span></td><td><a href='/guix/commit/nix/nix-daemon?id=79f9dee3c4c0e6d21066f142116a537207ae7ba4'>Use substitute servers on the local network.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/discover.scm: New file.
* Makefile.am (MODULES): Add it.
* nix/nix-daemon/guix-daemon.cc (options): Add "discover" option,
(parse-opt): parse it,
(main): start "guix discover" process when the option is set.
* guix/scripts/substitute.scm (%local-substitute-urls): New variable,
(substitute-urls): add it.
* gnu/services/base.scm (&lt;guix-configuration&gt;): Add "discover?"
field,
(guix-shepherd-service): honor it.
* doc/guix.texi (Invoking guix-daemon): Document "discover" option,
(Base Services): ditto.
</span></span></td><td>Mathieu Othacehe</td></tr>