keyutils: patch to allow symlinks in config dir

pkgs/os-specific/linux/keyutils/conf-symlink.patch

@@ -0,0 +1,13 @@
+diff --git a/request-key.c b/request-key.c
+index bf47c0a..105fee8 100644
+--- a/request-key.c
++++ b/request-key.c
+@@ -313,7 +313,7 @@ static void scan_conf_dir(struct parameters *params, const char *confdir)
+ 	while ((d = readdir(dir))) {
+ 		if (d->d_name[0] == '.')
+ 			continue;
+-		if (d->d_type != DT_UNKNOWN && d->d_type != DT_REG)
++		if (d->d_type != DT_UNKNOWN && d->d_type != DT_REG && d->d_type != DT_LNK)
+ 			continue;
+ 		l = strlen(d->d_name);
+ 		if (l < 5)

pkgs/os-specific/linux/keyutils/default.nix

@@ -15,6 +15,7 @@ stdenv.mkDerivation rec {
       url = "https://salsa.debian.org/debian/keyutils/raw/4cecffcb8e2a2aa4ef41777ed40e4e4bcfb2e5bf/debian/patches/Make-build-reproducible.patch";
       sha256 = "0wnvbjfrbk7rghd032z684l7vk7mhy3bd41zvhkrhgp3cd5id0bm";
     })
+    ./conf-symlink.patch
   ];
 
   BUILDDATE = "1970-01-01";