supercollider: fix build with emacs support (#352996)

  strictDeps = true;

  nativeBuildInputs = [ cmake pkg-config qttools ];

  nativeBuildInputs = [ cmake pkg-config qttools ]

    ++ lib.optionals useSCEL [ emacs ];

  buildInputs = [ gcc libjack2 libsndfile fftw curl libXt qtbase qtwebengine qtwebsockets readline ]

    ++ lib.optional (!stdenv.hostPlatform.isDarwin) alsa-lib

    ++ lib.optional useSCEL emacs;

    ++ lib.optional (!stdenv.hostPlatform.isDarwin) alsa-lib;

  hardeningDisable = [ "stackprotector" ];