nvidia_x11_legacy304: fix build with kernel 4.14

/cc #31640.

pkgs/os-specific/linux/nvidia-x11/default.nix

@@ -4,6 +4,15 @@ let
   generic = args: callPackage (import ./generic.nix args) { };
   kernel = callPackage # a hacky way of extracting parameters from callPackage
     ({ kernel, libsOnly ? false }: if libsOnly then { } else kernel) { };
+
+  maybePatch_drm_legacy =
+    lib.optional (lib.versionOlder "4.14" (kernel.version or "0"))
+      (fetchurl {
+        url = "https://raw.githubusercontent.com/MilhouseVH/LibreELEC.tv/b5d2d6a1"
+            + "/packages/x11/driver/xf86-video-nvidia-legacy/patches/"
+            + "xf86-video-nvidia-legacy-0010-kernel-4.14.patch";
+        sha256 = "18clfpw03g8dxm61bmdkmccyaxir3gnq451z6xqa2ilm3j820aa5";
+      });
 in
 {
   # Policy: use the highest stable version as the default (on our master).
@@ -23,6 +32,7 @@ in
     persistencedSha256 = "08315rb9l932fgvy758an5vh3jgks0qc4g36xip4l32pkxd9k963";
   };
 
+
   legacy_340 = generic {
     version = "340.104";
     sha256_32bit = "1l8w95qpxmkw33c4lsf5ar9w2fkhky4x23rlpqvp1j66wbw1b473";
@@ -31,15 +41,7 @@ in
     persistencedSha256 = "0zqws2vsrxbxhv6z0nn2galnghcsilcn3s0f70bpm6jqj9wzy7x8";
     useGLVND = false;
 
-    patches =
+    patches = maybePatch_drm_legacy;
-      lib.optional (lib.versionOlder "4.14" (kernel.version or "0"))
-        (fetchurl {
-          url = "https://raw.githubusercontent.com/MilhouseVH/LibreELEC.tv/b5d2d6a1"
-              + "/packages/x11/driver/xf86-video-nvidia-legacy/patches/"
-              + "xf86-video-nvidia-legacy-0010-kernel-4.14.patch";
-          sha256 = "18clfpw03g8dxm61bmdkmccyaxir3gnq451z6xqa2ilm3j820aa5";
-        })
-      ;
   };
 
   legacy_304 = generic {
@@ -65,6 +67,7 @@ in
           patches="$patches ${lib.concatMapStringsSep " " (pname: "${prefix}/${pname}.patch") pnames}"
         '';
     in applyPatches [ "fix-typos" ];
+    patches = maybePatch_drm_legacy;
   };
 
   legacy_173 = callPackage ./legacy173.nix { };