save extracted patch list in repo instead of requiring IFD

patch.nix

@@ -0,0 +1,21 @@
+{lib}: let
+  inherit (lib) importJSON;
+  createPatch = json: object: driverPackage:
+    driverPackage.overrideAttrs ({
+      version,
+      preFixup ? "",
+      ...
+    }: let
+      patchList = importJSON json;
+      patch = patchList.${version};
+    in {
+      preFixup =
+        preFixup
+        + ''
+          sed -i '${patch}' $out/lib/${object}.${version}
+        '';
+    });
+in {
+  patch-nvenc = createPatch ./patch.json "libnvidia-encode.so";
+  patch-fbc = createPatch ./patch-fbc.json "libnvidia-fbc.so";
+}