[LyX/master] Allow compiling with Qt6

[Jürgen Spitzmüller]

Am Dienstag, dem 16.03.2021 um 15:30 +0100 schrieb Jean-Marc
Lasgouttes:
> Needed, I do not know. I think it still works with Qt4.5 and we had
> one user at some time, but nobody knows whether it still compiles. In
> any case, it would be easy to fix if we got a report of broken LyX
> with 4.5 IMO.

IIRC master has some functions that were introduced in 4.7.

Jürgen

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