Make JPEG image loading work, by enabling the supplied libjpeg.

I'm staring too long at the valgrind output, which made loading jpegs fail:
<a href="http://rafb.net/paste/results/ovJIik75.html">http://rafb.net/paste/results/ovJIik75.html</a>;

Anyone has a clue why it doesn't work with my libjpeg? :-)
Is there any policy against the supplied image loading
libraries - I saw the PNG stuff enabled.....

If this is wrong, please revert.

Now that kde.org works, it's just fair to make apple.com also work ;-)
Screenie: <a href="/issues/2006-08-06/files/unity2.png">http://ktown.kde.org/~wildfox/ktown/unity2.png</a>;