phoc: depend on wayland-scanner

Otherwise, wayland-scanner would be picked up from the wayland in
buildInputs, which isn't cross-friendly and will stop working when we
split wayland-scanner into a separate package.

pkgs/applications/misc/phoc/default.nix

@@ -6,6 +6,7 @@
 , ninja
 , pkg-config
 , python3
+, wayland-scanner
 , wrapGAppsHook3
 , libinput
 , gobject-introspection
@@ -40,6 +41,7 @@ stdenv.mkDerivation (finalAttrs: {
     ninja
     pkg-config
     python3
+    wayland-scanner
     wrapGAppsHook3
   ];