nonstd::expected includes windows.h when exceptions are disabled

Including windows.h is a fairly disastrous thing to do in many project. We can probably avoid it by setting [-Dnsel_CONFIG_NO_EXCEPTIONS_SEH=0](https://github.com/martinmoene/expected-lite#enable-seh-exceptions).

See https://community.cesium.com/t/unable-to-package-ue5-0-3-project-with-cesium-v1-19-0/21162/19

Start by locating where expected-lite is configured or included in the C++ build, then reproduce a build with exceptions disabled and inspect whether windows.h is pulled in. The issue's suggested NO_EXCEPTIONS_SEH setting is the starting point; done means the affected configuration no longer includes windows.h and still builds successfully.

Written by the indexing model from the issue text.