ecdsautils: refactor

this shouldn't create any rebuilds

pkgs/by-name/ec/ecdsautils/package.nix

@@ -9,17 +9,14 @@
   libuecc,
 }:
 
-let
+stdenv.mkDerivation (finalAttrs: {
   pname = "ecdsautils";
   version = "0.4.2";
-in
-stdenv.mkDerivation {
-  inherit pname version;
 
   src = fetchFromGitHub {
     owner = "freifunk-gluon";
     repo = "ecdsautils";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     sha256 = "sha256-vGHLAX/XOtePvdT/rljCOdlILHVO20mCt6p+MUi13dg=";
   };
 
@@ -47,4 +44,4 @@ stdenv.mkDerivation {
     maintainers = [ ];
     platforms = lib.platforms.unix;
   };
-}
+})