Re:#9966 Fix Crash in MZFlickable

[strseb]

Soooo i did set up a 6.8 dev build and was able to repro the crash seen in #9966 - this is a fun one.
In 6.8.0 we get the "onHeightChange" before the window has finished to initialize, so that when we call mapToItem(window.contentItem) we defer a nullptr and crash.

[strseb]

Qt 6.8.0 no longer links to this it seems so we need to manually declare that :)

[oskirby]

For windows at least, I think we tend to handle this using pragmas: #pragma comment(lib, "Iphlpapi")

[strseb]

This errored and i think noone is using it, so let's just remove it.

[strseb]

qAsConst is depricated in 6.8.0

[oskirby]

Looks good.

Just one minor nitpick about how to link libraries on Windows, but it's not worth holding the patch up if you feel strongly about it.

[XavierCLL]

Hi @strseb

I am not sure if the purpose of this PR is fix all the problems with Qt6.8, I applied this patch (also this one 9961) to the stable version, and the UI is usable, but one thing is not working, when I click in the list of servers "Select location", the UI crash with the following traceback:

trace.txt

[strseb]

Hey @XavierCLL - i was not expecting one small patch to magically fix all issues that might arise with 6.8 :)
Given that we're still shipping the client on most plattforms with qt6.6 i really appreciate i really appreciate the testing, posting traces and bug's filed :)
Let's pull that stacktrace into a new bug and we'll tackle it from there.