waydroid: Add missing ambiant dependencies

Fixes #211741

`waydroid first-launch` would fail due to missing gobject introspection
bindings for Gtk.

```
(      ) [        ] ERROR: Namespace Gtk not available
(      ) [        ] See also: <https://github.com/waydroid>
(      ) [        ] Traceback (most recent call last):
  File "/nix/store/7c0jjr0jid4xhfdsv13jiwp7q4jl9khi-waydroid-1.3.3/lib/waydroid/tools/__init__.py", line 113, in main
    actions.remote_init_client(args)
  File "/nix/store/7c0jjr0jid4xhfdsv13jiwp7q4jl9khi-waydroid-1.3.3/lib/waydroid/tools/actions/initializer.py", line 205, in remote_init_client
    gi.require_version("Gtk", "3.0")
  File "/nix/store/y09awdg92zm58958q6bc6chacw35pfgm-python3.10-pygobject-3.42.2/lib/python3.10/site-packages/gi/__init__.py", line 126, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gtk not available
```

These changes add the necessary environment (the currently idiomatic way
to solve such problems) to the existing wrapper.

The use in `preFixup` is necessary, as the gapps wrapper will not have
ran the required hooks before.

The addition of `gobject-introspection` is necessary for the wrappers
hooks to add GIR repositories to the wrapper args.

pkgs/os-specific/linux/waydroid/default.nix

@@ -4,12 +4,15 @@
 , dnsmasq
 , gawk
 , getent
+, gobject-introspection
+, gtk3
 , kmod
 , lxc
 , iproute2
 , nftables
 , util-linux
 , which
+, wrapGAppsHook
 , xclip
 }:
 
@@ -25,6 +28,15 @@ python3Packages.buildPythonApplication rec {
     sha256 = "sha256-0GBob9BUwiE5cFGdK8AdwsTjTOdc+AIWqUGN/gFfOqI=";
   };
 
+  buildInputs = [
+    gtk3
+  ];
+
+  nativeBuildInputs = [
+    gobject-introspection
+    wrapGAppsHook
+  ];
+
   propagatedBuildInputs = with python3Packages; [
     gbinder-python
     pyclip
@@ -35,9 +47,14 @@ python3Packages.buildPythonApplication rec {
   dontUsePipInstall = true;
   dontUseSetuptoolsCheck = true;
   dontWrapPythonPrograms = true;
+  dontWrapGApps = true;
 
   installPhase = ''
     make install PREFIX=$out USE_SYSTEMD=0 USE_NFTABLES=1
+  '';
+
+  preFixup = ''
+    makeWrapperArgs+=("''${gappsWrapperArgs[@]}")
 
     wrapProgram $out/lib/waydroid/data/scripts/waydroid-net.sh \
        --prefix PATH ":" ${lib.makeBinPath [ dnsmasq getent iproute2 nftables ]}