libical: fix tests with 32-bit time_t

A test added in the latest version fails with 32-bit time_t.
Use the upstream fix until the next version is released.
Fixes pkgsi686Linux.libical and dependers, such as lutris

pkgs/development/libraries/libical/default.nix

@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchurl
 , buildPackages
 , cmake
 , glib
@@ -74,6 +75,17 @@ stdenv.mkDerivation rec {
     # Will appear in 3.1.0
     # https://github.com/libical/libical/issues/350
     ./respect-env-tzdir.patch
+
+    # Fixes tests with 32-bit time_t
+    # Remove with next version update (v3.0.16+)
+    (fetchurl {
+      url = "https://github.com/libical/libical/commit/4adc6f1d2b39a1cc3363b57215e12fa81076498b.patch";
+      sha256 = "1k3hav0z86kc1xd1sk23b57aqqjk4gf73574w7f1m66cyz98bxr3";
+    })
+    (fetchurl {
+      url = "https://github.com/libical/libical/commit/cce20bd051408b00521385c0bfb616ba068450d3.patch";
+      sha256 = "097hqmagl0q5p38r1kvx0592cfac2y7jbdqlis6m8gbs812pbqfc";
+    })
   ];
 
   # Using install check so we do not have to manually set