QtNetworkAuth fails to build when Qt is configured with FEATURE_thread=OFF

This was discovered while trying to build QtNetworkAuth targeting WebAssembly ( a static build)

https://codereview.qt-project.org/c/qt/qt5/+/336695/25

But can be easily reproduced by configuring a host Qt with -shared and -no-feature-thread (which implies -no-feature-http).

If one gets past the compilation errors, you get multiple link errors.
The source files either need to be adapted to properly handle QT_NO_HTTP or the module should skip building anything if the feature is disabled.