Remove Qt3 Support classlist page.
Remove Qt3 Support classlist page.

This page is obsolete, also it caused a SIGABRT when generating DITA,
probably because the \generatelist compatclasses does not work properly
when using the ditaxmlgenerator.

Change-Id: I076f4188c40029b17ccbcd9746bdba98943e8c71
Sanity-Review: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Casper van Donderen <808524cef5c654648bea2a2b954f3b3445ed083c@nokia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc