Reexport older versions of raw-window-handle

[linkmauve]

When the user decides to use an older version of raw-window-handle, through the rwh_04 or rwh_05 features, it makes sense to reexport the crate so they don’t have to depend on it manually and can instead use winit::raw_window_handle.

• [x] Tested on all platforms changed
• [x] Added an entry to the changelog module if knowledge of this change could be valuable to users
• [x] Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior