[Qt-creator] Updating requirements for building Qt Creator 7+ (master branch)

[Eike Ziller]

Another one:

# Bumping the required CMake version for building Qt Creator to CMake 3.16 and later

Seems to be available on Ubuntu 20.04 and Debian 11 and others (https://pkgs.org/search/?q=cmake), and lets us get rid of some workarounds.

Require CMake 3.16 and remove workarounds (I32500375) · Gerrit Code Review
https://codereview.qt-project.org/c/qt-creator/qt-creator/+/392678

> On 14 Jan 2022, at 13:44, Eike Ziller <Eike.Ziller at qt.io> wrote:
> 
> # Bumping the required Qt version for building Qt Creator from Qt 5.14 to Qt 5.15.2.
> 
> Qt 5.15.2 contains API that eases the transition to Qt 6. So far we added workarounds for Qt 5.14, that we could remove, and we then also don’t need to add more of them in new code.
> 
> Regarding Linux distributions, Ubuntu 21 and Debian 11 seem to have Qt 5.15.2, and others too (https://pkgs.org/search/?q=qtbase)
> 
> Bump requirement to Qt 5.15.2 (I920fdccc) · Gerrit Code Review
> https://codereview.qt-project.org/c/qt-creator/qt-creator/+/390103
> 
> # Removing qmake as a build system for building Qt Creator itself
> 
> The CMake port is “done”, and official packages are built with CMake. The qmake build is basically untested, and maintaining it in addition is a burden. We also had a nice transitioning period of more than a year (Qt Creator 4.14 being the first version that was released based on the CMake build).
> 
> Remove qmake build files (I846c6ef6) · Gerrit Code Review
> https://codereview.qt-project.org/c/qt-creator/qt-creator/+/390104
> 
> Br, Eike
> 
> -- 
> Eike Ziller
> Principal Software Engineer
> 
> The Qt Company GmbH
> Erich-Thilo-Straße 10
> D-12489 Berlin
> eike.ziller at qt.io
> http://qt.io
> Geschäftsführer: Mika Pälsi,
> Juha Varelius, Jouni Lintunen
> Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B
> 
> 
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-- 
Eike Ziller
Principal Software Engineer

The Qt Company GmbH
Erich-Thilo-Straße 10
D-12489 Berlin
eike.ziller at qt.io
http://qt.io
Geschäftsführer: Mika Pälsi,
Juha Varelius, Jouni Lintunen
Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B