Bug#898659: mark symbol as optional, not found when building with -O3

[Matthias Klose]

Package: src:dde-qt-dbus-factory
Version: 1.0.1-2
Tags: patch

Mark symbol as optional, not found when building with -O3.

patch at
http://launchpadlibrarian.net/370217494/dde-qt-dbus-factory_1.0.1-2_1.0.1-2ubuntu1.diff.gz