Bug#971326: mgba: uses deprecated libavresample

[Sebastian Ramacher]

Source: mgba
Version: 0.8.3+dfsg-1
Severity: important
Tags: sid bullseye
Usertags: libavresample-removal
Control: block 971318 by -1

Dear maintainer,

mgba currently Build-Depends or Depends on libavresample-dev. The
ffmpeg developers consider libavresample as obsolete and replaced the
library with libswresample. Please switch mgba to use libswresample.

Note that this switch will require changes if mgba doesn't already
have support for libsvresample.

Cheers