Update to version 1.1.1 released on August 31st, 2015 [1].

[1] https://cgit.freedesktop.org/vdpau/libvdpau/log/

Currently, on machines with modern Nvidia graphics devices using the
current driver (367.x), ffmpeg fails to start, as libvdpau.so.1 is not
there.

Fix this by using the generic library, which is shipped separately.

```
pmenzel@keineahnung:~> more /dev/shm/nvidia_current-368.57-0.x86_64/source/NVIDIA_Changelog

2016-01-05 version 361.16

    * Removed the VDPAU wrapper and trace libraries libvdpau.so.1 and
      libvdpau_trace.so.1 from the driver package.  These libraries may be
      available via your distribution's package management system, or can be
      compiled from the sources available at:

        http://people.freedesktop.org/~aplattner/vdpau/

      Please see

        http://freedesktop.org/wiki/Software/VDPAU/

      for more information.
```