treewide: remove stdenv where not needed

pkgs/development/compilers/pakcs/curry-base.nix

@@ -1,5 +1,5 @@
 { mkDerivation, base, Cabal, containers, directory, extra, filepath
-, mtl, parsec, pretty, lib, stdenv, time, transformers
+, mtl, parsec, pretty, lib, time, transformers
 }:
 mkDerivation {
   pname = "curry-base";

pkgs/development/compilers/pakcs/curry-frontend.nix

@@ -1,6 +1,6 @@
 { mkDerivation, base, bytestring, Cabal, containers, curry-base
 , directory, extra, file-embed, filepath, mtl, network-uri, pretty
-, process, set-extra, lib, stdenv, template-haskell, transformers
+, process, set-extra, lib, template-haskell, transformers
 }:
 mkDerivation {
   pname = "curry-frontend";