qt_version <= qt5.14 compile error

[WangPengZhan]

when Qt <= 5.14, threadData is QThreadData* Type Qt > 5.14 , threadData is QAtomicPointer Type

https://github.com/stdware/qwindowkit/blob/e5c3837218c3dc2b7b327f11de5894b9350adbc9/src/core/qwkglobal.cpp#L30

when qt <= 5.14, error occurred when complied.

do you want to support qt version bewteen 5.12 and 5.14?

[SineStriker]

OK I'll fix this.

[WangPengZhan]

I have fixed this issue and will push it for PR tomorrow

[WangPengZhan]

https://github.com/stdware/qwindowkit/pull/98

[SineStriker]

等会，你PR错分支了，应该到main。

[WangPengZhan]

你可以帮我cherry-pick到main分支么？