Based on the Flathub patch but only skip the mtime test when in an ostree
(different versions have used 0 or 1 as the mtime for all files).

https://github.com/flathub/org.videolan.VLC/blob/master/vlc-ignore-time-for-cache.patch

diff --git a/src/modules/bank.c b/src/modules/bank.c
index 2e67a0d07e..ab2915fbb7 100644
--- a/src/modules/bank.c
+++ b/src/modules/bank.c
@@ -275,7 +275,8 @@ static int AllocatePluginFile (module_bank_t *bank, const char *abspath,
         plugin = vlc_cache_lookup(&bank->cache, relpath);
 
         if (plugin != NULL
-         && (plugin->mtime != (int64_t)st->st_mtime
+         && (((int64_t)st->st_mtime > (int64_t)1
+           && plugin->mtime != (int64_t)st->st_mtime)
           || plugin->size != (uint64_t)st->st_size))
         {
             msg_Err(bank->obj, "stale plugins cache: modified %s",
                     plugin->abspath);
-- 
2.21.0