unduplicate the assembling of the GeneratedFiles dir in Qt.core

Change-Id: If5219c26fbe54731cc9d4b2b149e305e23de8e47
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
remove legacy .qbp file support

Change-Id: I18c819d4e4bbfba16ca0522247ebf9fbc6ac6ae4
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>