Revert "nixos: doc: implement related packages in the manual"

pkgs/applications/virtualization/qemu/default.nix

@@ -101,10 +101,6 @@ stdenv.mkDerivation rec {
     else if stdenv.isAarch64 then ''makeWrapper $out/bin/qemu-system-aarch64 $out/bin/qemu-kvm --add-flags "\$([ -e /dev/kvm ] && echo -enable-kvm)"''
     else "";
 
-  passthru = {
-    qemu-system-i386 = "bin/qemu-system-i386";
-  };
-
   meta = with stdenv.lib; {
     homepage = http://www.qemu.org/;
     description = "A generic and open source machine emulator and virtualizer";

pkgs/applications/virtualization/xen/4.5.nix

@@ -248,10 +248,4 @@ callPackage (import ./generic.nix (rec {
       -i tools/libxl/libxl_device.c
   '';
 
-  passthru = {
-    qemu-system-i386 = if withInternalQemu
-      then "lib/xen/bin/qemu-system-i386"
-      else throw "this xen has no qemu builtin";
-  };
-
 })) ({ ocamlPackages = ocamlPackages_4_02; } // args)

pkgs/applications/virtualization/xen/4.8.nix

@@ -176,10 +176,4 @@ callPackage (import ./generic.nix (rec {
       -i tools/libxl/libxl_device.c
   '';
 
-  passthru = {
-    qemu-system-i386 = if withInternalQemu
-      then "lib/xen/bin/qemu-system-i386"
-      else throw "this xen has no qemu builtin";
-  };
-
 })) args