Qt5 is required

[Stephen Kelly]

David Faure wrote:

> Stephen, you mentionned a script to get rid of the ifdefs for Qt4/Qt5, do
> you have that at hand, or does it need to be written?

It needed to be adapted from another script that I have. Actually I needed 
two scripts - one to handle #if < 5.0.0, and another for #if >= 5.0.0.

Used and pushed now.

Can we get rid of libinqt5 now?

Thanks,

Steve.