qt6.qtdeclarative: drop outdated workarounds

  pname = "qtdeclarative";

  qtInputs = [ qtbase qtlanguageserver qtshadertools ];

  propagatedBuildInputs = [ openssl python3 ];

  preConfigure = ''

    export LD_LIBRARY_PATH="$PWD/build/lib''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH"

  '';

  cmakeFlags = [

    "-DQT6_INSTALL_PREFIX=${placeholder "out"}"

    "-DQT_INSTALL_PREFIX=${placeholder "out"}"

  ];

  patches = [

    # prevent headaches from stale qmlcache data

    ../patches/qtdeclarative-default-disable-qmlcache.patch

  ];

  postInstall = ''

    substituteInPlace "$out/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake" \

      --replace ''\'''${QT6_INSTALL_PREFIX}' "$dev"

  '';

  devTools = [

    "bin/qml"

    "bin/qmlcachegen"