doublecmd: refactor to new overlay-style overridable attributes

pkgs/applications/file-managers/doublecmd/default.nix

···
 , wrapQtAppsHook
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "doublecmd";
   version = "1.0.8";
 
   src = fetchFromGitHub {
     owner = "doublecmd";
     repo = "doublecmd";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-kuqleoDoxzOj3baTK0lBJpbDECoHeFubWhLXAVkEqAk=";
   };
 
···
     libqt5pas
   ];
 
-  NIX_LDFLAGS = "--as-needed -rpath ${lib.makeLibraryPath buildInputs}";
+  NIX_LDFLAGS = "--as-needed -rpath ${lib.makeLibraryPath finalAttrs.buildInputs}";
 
   postPatch = ''
     patchShebangs build.sh install/linux/install.sh
···
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = with platforms; linux;
   };
-}
+})
 # TODO: deal with other platforms too