update to Qt 6.8.3

Merge pull request #39 from wsxarcher/patch-4

Explicit cast qwin10helpers.cpp GetProcAddress

v6.8.1

one more change from Qt 6.8.2

update to Qt 6.8.2

turn off directwrite fonts on Windows prior to Windows 10 (issue https://github.com/crystalidea/qt6windows7/issues/33)

Merge pull request #28 from wsxarcher/patch-1

Update README.md

fixed #26

qwindowsintegration.cpp original

Merge pull request #29 from wsxarcher/patch-2

Merge pull request #30 from wsxarcher/patch-3

fix gcc compilation of pointer comparison

Fix mingw cross compilation