Removing libqt5quick5-gles as potential GCompris dependency

[Johnny Jazeix <jazeix@gmail.com>]

Hi,

thank you for your work on packaging GCompris and other applications.

We had a second bug report
(https://invent.kde.org/education/gcompris/-/issues/31 then
https://bugs.kde.org/show_bug.cgi?id=474095) where some images were
not loaded.

Both were due to the fact that the GCompris package
(https://packages.debian.org/fr/sid/gcompris-qt) uses
libqt5quick5-gles instead of libqt5quick5. Both are marked as
compatible as dependency but the former one causes this issue.

Is it possible to mark libqt5quick5-gles as incompatible with GCompris
or do you see other reasons that we cannot do it?

Cheers,

Johnny