[Development] Qt 6 co-installability with Qt 5

[Marius Kittler]

Am Dienstag, 27. Oktober 2020, 19:48:43 CET schrieben Sie:
> The library now has the Qt6 prefix in its name, so it should not be an
> issue. Or are you thinking of something else?

No, I wasn't thinking about something else. I've now built beta2 for Windows 
and the library is indeed called `libQt6EntryPoint.a.`. I'm glad to be able to 
drop this patch. (Generally, the new CMake-based build system works much 
better out-of-the box.)