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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<tr><td><span title='2022-06-04 12:04:23 +0200'>2022-06-04</span></td><td><a href='/guix/commit/tests/cache.scm?id=104b4e25ab7da5697f2f6f1ddfdd4955f05afece'>cache: Catch invalid 'last-expiry-cleanup'.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;http://issues.guix.gnu.org/55638&gt;.

* guix/cache.scm (maybe-remove-expired-cache-entries)[last-expiry-date]:
Use 'get-string-all' + 'string-&gt;number' instead of 'read'; ignore
invalid numbers.
* tests/cache.scm ("maybe-remove-expired-cache-entries, empty cache")
("maybe-remove-expired-cache-entries, corrupted cache"): New tests.

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
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