Re: [PATCH v2 0/2] MR10583: amstream: Only provide MediaType on first retrieval.

[Brendan McGrath (＠redmcg)]

v2:
- Change commit messages to reflect the specifics of amstream
- Add additional tests to show that `GetMediaType()`:
  - will provide a media type every time on the first retrieval; and
  - will never provide a media type when called on subsequent retrievals

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10583#note_135622