use centralized handling of QT_BUILD_PARTS
use centralized handling of QT_BUILD_PARTS

Change-Id: Id4e0244015c828d855e4f3485cf18ef77e48e3d6
Reviewed-by: Rohan McGovern <d75463945f40a9669160a73cef2843e56b22c602@nokia.com>

maui-packages/qtfeedback,maui-packages/qtfeedback