kakoune: remove pkg-config, cleanup preConfigure

pkgs/applications/editors/kakoune/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, pkg-config }:
+{ lib, stdenv, fetchFromGitHub }:
 
 with lib;
 
@@ -11,12 +11,10 @@ stdenv.mkDerivation rec {
     rev = "v${version}";
     sha256 = "13kc68vkrzg89khir6ayyxgbnmz16dhippcnw09hhzxivf5ayzpy";
   };
-  nativeBuildInputs = [ pkg-config ];
-  makeFlags = [ "debug=no" ];
+  makeFlags = [ "debug=no" "PREFIX=${placeholder "out"}" ];
 
   preConfigure = ''
     export version="v${version}"
-    export PREFIX=$out
   '';
 
   enableParallelBuilding = true;