qt54: don't propagate build inputs

This disables propagated of Qt 5 build inputs at the request of
@edolstra. If this breaks your build, you need to add the missing
dependencies yourself. If this breaks your package at runtime, you need
to wrap your package to set either the plugin path or the QML import
path.

pkgs/development/libraries/qt-5/5.4/setup-hook.sh

@@ -24,12 +24,6 @@ addQtModule() {
             @lndir@/bin/lndir -silent "$1/lib" "$qtOut/lib"
             find "$1/lib" -printf 'lib/%P\n' >> "$qtOut/nix-support/qt-inputs"
         fi
-
-        propagatedBuildInputs+=" $1"
-    fi
-
-    if [[ -d "$1/lib/qt5/qml" ]] || [[ -d "$1/lib/qt5/plugins" ]] || [[ -d "$1/lib/qt5/imports" ]]; then
-        propagatedUserEnvPkgs+=" $1"
     fi
 }