Add systemd to build deps for hyprland

flake.nix

···
                     cmakeFlags = (old.cmakeFlags or [ ]) ++ [ "-DGLAZE_ENABLE_OPENSSL=ON" ];
                   });
                   hyprland = inputs.hyprland.packages.${final.system}.hyprland.overrideAttrs (old: {
-                    buildInputs = (old.buildInputs or [ ]) ++ [ final.glaze ];
+                    # Ensure systemd support is enabled so UWSM can pass watchdog fd.
+                    buildInputs = (old.buildInputs or [ ]) ++ [ final.glaze final.systemd ];
+                    cmakeFlags = (old.cmakeFlags or [ ]) ++ [ "-DNO_SYSTEMD=OFF" ];
                     postPatch = (old.postPatch or "") + ''
                       # Ensure OpenSSL target exists before using glaze::glaze
                       sed -i '1ifind_package(OpenSSL REQUIRED)' hyprpm/CMakeLists.txt