Don't sweat the windows.h stuff. Add that qt6-webengine-dev-tools package and try the build again. Don't worry about the USE_SYSTEM_LIBS stuff for now either. Leave it like you have it (or just remove -DUSE_SYSTEM_LIBS=1 like Kevin mentioned).
Delete the contents of your build directory before rebuilding, though (or at least delete the CMakeCache.txt file).
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