Revert "xconq: Simplify package with tcl.tclPackageHook"

This reverts commit 113826a892512eb2e19985310fd7d4a39db4d75e, which
ended up breaking the Tk import at runtime.

pkgs/games/xconq/default.nix

@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ cpio xorgproto libX11 libXmu libXaw libXt tcl tk libXext
-    fontconfig makeWrapper tcl.tclPackageHook ];
+    fontconfig makeWrapper ];
 
   configureFlags = [
     "--enable-alternate-scoresdir=scores"
@@ -39,6 +39,12 @@ stdenv.mkDerivation rec {
     sed -re 's@MediumBlue@LightBlue@g' -i tcltk/tkconq.tcl
   '';
 
+  postInstall = ''
+    for file in $out/bin/*; do
+      wrapProgram $file --prefix TCLLIBPATH ' ' "${tk}/lib"
+    done
+  '';
+
   meta = with lib; {
     description = "A programmable turn-based strategy game";
     maintainers = with maintainers; [ raskin ];