nixGL: patch systemd and d-bus services references

modules/targets/generic-linux/nixgl.nix

@@ -274,6 +274,26 @@ in
                   sed "s|${pkg.out}|$out|g" "$src" > "$dsk"
                 done
 
+                # Patch systemd user services
+                for svc in "$out/share/systemd/user"/*.service ; do
+                  if ! grep -q "${pkg.out}" "$svc"; then
+                    continue
+                  fi
+                  src="$(readlink "$svc")"
+                  rm "$svc"
+                  sed "s|${pkg.out}|$out|g" "$src" > "$svc"
+                done
+
+                # Patch DBus services
+                for svc in "$out/share/dbus-1/services"/*.service ; do
+                  if ! grep -q "${pkg.out}" "$svc"; then
+                    continue
+                  fi
+                  src="$(readlink "$svc")"
+                  rm "$svc"
+                  sed "s|${pkg.out}|$out|g" "$src" > "$svc"
+                done
+
                 shopt -u nullglob # Revert nullglob back to its normal default state
               '';
           }))