ffmpeg: enable SMB support for mpv
Enables SMB support in FFmpeg. This is needed for ensuring that mpv 0.33 still can playback files with smb:// protocol.
Depends on D10022.
Test Plan: Checked that mpv smb://remote-file still works with mpv 0.33.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Differential Revision: https://dev.getsol.us/D10023