decklink: fix build for kernel 6.13

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

···
   lib,
   blackmagic-desktop-video,
   kernel,
+  fetchpatch,
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "decklink";
···
   # and desktop service, since the version of the two have to match anyways.
   # See pkgs/by-name/bl/blackmagic-desktop-video/package.nix for more.
   inherit (blackmagic-desktop-video) src version;
+
+  patches = lib.optionals (lib.versionAtLeast kernel.modDirVersion "6.13") [
+    # needed for version 14.4.x to build for kernel 6.13
+    (fetchpatch {
+      name = "01-update-makefiles";
+      url = "https://aur.archlinux.org/cgit/aur.git/plain/01-update-makefiles.patch?h=decklink";
+      hash = "sha256-l3iu0fG/QJMdGI/WSlNn+qjF4nK25JxoiwhPrMGTqE4=";
+    })
+  ];
 
   KERNELDIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
   INSTALL_MOD_PATH = placeholder "out";