Pretend that stat's mtime is broken, so that the fontconfig cache does not
depend upon modification time to determine if a cache is stale.

diff --git a/src/fcstat.c b/src/fcstat.c
index 5a2bd7c..d603a96 100644
--- a/src/fcstat.c
+++ b/src/fcstat.c
@@ -431,6 +431,7 @@ FcIsFsMmapSafe (int fd)
 FcBool
 FcIsFsMtimeBroken (const FcChar8 *dir)
 {
+    return FcTrue;
     int fd = FcOpen ((const char *) dir, O_RDONLY);
 
     if (fd != -1)
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<div class='path'>path: <a href='/guix/log/?id=94f960ffed3f4ede944e9b0e4543f425114047d8'>root</a>/<a href='/guix/log/tests?id=94f960ffed3f4ede944e9b0e4543f425114047d8'>tests</a>/<a href='/guix/log/tests/containers.scm?id=94f960ffed3f4ede944e9b0e4543f425114047d8'>containers.scm</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/tests/containers.scm?id=94f960ffed3f4ede944e9b0e4543f425114047d8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-04-02 18:15:37 +0200'>2019-04-02</span></td><td><a href='/guix/commit/tests/containers.scm?id=af76c020bf19de5fe2e92f31d8b85cbd55c481de'>linux-container: Make the guest UID and GID a parameter.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-31 17:08:45 +0200'>2017-05-31</span></td><td><a href='/guix/commit/tests/containers.scm?id=3e894917414239cab1737d89feb263e0825ae7c5'>tests: Fix race condition in 'container-excursion*' test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-02-07 00:08:10 +0100'>2017-02-07</span></td><td><a href='/guix/commit/tests/containers.scm?id=c90db25f4cf1f98f3f4f3af38d175a14ffb8c32a'>linux-container: Add 'container-excursion*'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-13 13:04:00 +0100'>2016-11-13</span></td><td><a href='/guix/commit/tests/containers.scm?id=a24b56fa8d64d9c6b8348c439cc988dbcebc911f'>tests: Don't check file-systems in container tests.</a><span class='msg-avail'>...</span></td><td>Andy Patterson</td></tr>
<tr><td><span title='2016-11-10 18:01:44 +0100'>2016-11-10</span></td><td><a href='/guix/commit/tests/containers.scm?id=5970e8e248f6327c41c83b86bb2c89be7c3b1b4e'>container: Pass a list of &lt;file-system&gt; objects as things to mount.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-19 15:54:10 +0200'>2016-10-19</span></td><td><a href='/guix/commit/tests/containers.scm?id=7fee5b53973fb4fe049aa0bc5db58093727bdf30'>container: Allow 'container-excursion' to the same namespaces.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-25 01:13:23 +0200'>2016-06-25</span></td><td><a href='/guix/commit/tests/containers.scm?id=25a3bfbe77cb45aa26f9af8c72e7f978a177187e'>tests: Skip all the container tests when needed.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>