Fix the static build (#1534)

* openssl linking fix is required after all

* remove Cabal override (obsoleted on new nixpkgs)

nix/overlays/haskell-packages/default.nix

@@ -1,10 +1,7 @@
-{ compiler, static ? false }:
+{ compiler, extraOverrides ? (final: prev: { }) }:
 
 self: super:
 let
-  lib =
-    self.haskell.lib;
-
   overrides =
     final: prev:
     rec {
@@ -15,16 +12,7 @@ let
             ver = "0.3.0";
             sha256 = "0iwh4wsjhb7pms88lw1afhdal9f86nrrkkvv65f9wxbd1b159n72";
           } { };
-
-      cabal2nix =
-        if static then
-        # cabal2nix depends on Cabal 3.0.*, while our pinned version of
-        # Nixpkgs only provides 2.4 or 3.2. So we pinned 3.0.0.0 in
-        # ./Cabal.nix
-          prev.cabal2nix.overrideScope (self: super: { Cabal = self.callPackage ./Cabal.nix { }; })
-        else
-          prev.cabal2nix;
-    };
+    } // extraOverrides final prev;
 in
 {
   haskell =