[FFmpeg-cvslog] configure: properly add dxva2 link dependencies

[Carl Eugen Hoyos]

2016-11-16 14:14 GMT+01:00 Hendrik Leppkes <git at videolan.org>:
> ffmpeg | branch: master | Hendrik Leppkes <h.leppkes at gmail.com> | Sat Nov 12 02:02:29 2016 +0100| [99218ee30d7c1a3c49cf5f45a8b4cb4cd34d8199] | committer: Hendrik Leppkes
>
> configure: properly add dxva2 link dependencies
>
> Fixes building with --disable-everything --enable-shared --enable-dxva2

Assuming you tested this, please apply.

Carl Eugen