Log Message:
Update net/get_iplayer to version 2.97.

pkgsrc changes:

  - Migrate to GitHub.
  - Remove no longer valid options file.
  - Simplify patching.

Upstream changes since 2.94:

  A significant number of changes have been made since 2.94, so for the
  full list of changes please refer to the release notes for each release
  since then here:

  https://github.com/get-iplayer/get_iplayer/wiki/release297
  https://github.com/get-iplayer/get_iplayer/wiki/release296
  https://github.com/get-iplayer/get_iplayer/wiki/release295

  The most visible change (for me) is that get_iplayer now defaults to
  fetching the best quality file as a transport stream, rather than the
  previous default of lower quality flash.