Qnx: Remove dependency on gui-private

Was used in blackberrydebugtokenreader.cpp, but is not
used anymore.

Change-Id: Ie55b2ab08773d0f541efb1a22e0c21c36f4ba7b3
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/qnx/qnx.pro

@@ -75,8 +75,6 @@ FORMS += \
     qnxsettingswidget.ui \
     qnxdeployqtlibrariesdialog.ui
 
-QT += gui-private
-DEFINES += QNX_ZIP_FILE_SUPPORT
 
 DEFINES += QT_NO_CAST_TO_ASCII QT_NO_CAST_FROM_ASCII