Building fails with vendored deps

[v-morlock]

Hi, due to the use of the "document features" crate, this crate won't build when vendoring dependencies. (slint-ui/document-features#20)

Would it be possible to place this behind a feature flag or sth similar to make building with vendored dependencies possible? That's relevant eg when packaging for nix.

[oscartbeaumont]

Should be fixed on main now. I am planning on releasing 2.0.0-rc.3 next Monday if all goes to plan.

[v-morlock]

thanks a lot!