Remove Qt < 5.2 conditionals and special code

[Jürgen Spitzmüller]

Am Donnerstag, dem 17.08.2023 um 10:01 +0200 schrieb Jürgen
Spitzmüller:
> According to the README, we require Qt 5.2 or higher for 2.4.
> 
> There is still some code for Qt < 5.2 in the source. Particularly a
> self-baked "Don't ask me again" warning dialog.
> 
> OK to remove that (see patch)?

I also found some Qt 5.1 checks, see updated patch.

-- 
Jürgen
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