We need to add the base include directory to allow this type of
includes to work. The same approach is taken by all other modules.

Merge-request: 2
Change-Id: I3bdac5fe0096637b42dae49e306761f489fff8ff
Reviewed-on: http://codereview.qt-project.org/5909


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>