Synced QT_BUILD_PARTS in .qmake.cache and projects.pro for Symbian.
Synced QT_BUILD_PARTS in .qmake.cache and projects.pro for Symbian.

Projects.pro is forcing QT_BUILD_PARTS to omit docs and translations,
but configure still outputted those into .qmake.cache. Fixed
configure to also omit them for Symbian builds to make building demos
work equally whether built by from root or not.

Task-number: QT-1018
Reviewed-by: axis

igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,radekp/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,radekp/qt,pruiz/wkhtmltopdf-qt,radekp/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,radekp/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,radekp/qt,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,radekp/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt