Pre-emptive changes to StringBuilder compile anomaly.

Pre-emptive changes to StringBuilder compile anomaly.

The StringBuilder issue occured after making changes to the pro file.
This change adds the use of QT_USE_QSTRINGBUILDER, however it does not
compile correctly with the above change. Added QByteArray to explicitly
define the dynamic name and return it back as char*.

Change-Id: I23ec434deb52da2d7b27f3e7fb17ceba4aa36d4f
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: hjk <qthjk@ovi.com>