ukmm: fix running on x11

Also switches from using LD_LIBRARY_PATH to RUSTFLAGS to include
required runtime libraries.

pkgs/tools/games/ukmm/default.nix

@@ -5,6 +5,7 @@
 , pkg-config
 , wrapGAppsHook3
 , libglvnd
+, libxkbcommon
 , nix-update-script
 }:
 
@@ -35,9 +36,21 @@ rustPlatform.buildRustPackage rec {
     wrapGAppsHook3
   ];
 
-  preFixup = ''
-    gappsWrapperArgs+=(--prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ libglvnd ]})
-  '';
+  buildInputs = [
+    libglvnd
+    libxkbcommon
+  ];
+
+  # Force linking to libEGL, which is always dlopen()ed, and to
+  # libwayland-client & libxkbcommon, which is dlopen()ed based on the
+  # winit backend.
+  RUSTFLAGS = map (a: "-C link-arg=${a}") [
+    "-Wl,--push-state,--no-as-needed"
+    "-lEGL"
+    "-lwayland-client"
+    "-lxkbcommon"
+    "-Wl,--pop-state"
+  ];
 
   cargoTestFlags = [
     "--all"