We need to stick to FFmpeg r7407 for now. This mostly reverts [30b23594]. Thus, we don't need a recent GNU Make either.

Remove check for img_resample() when ffmpeg is built with libswscale. This will need to be fixed for 0.9.0 or a later bugfix release.

Refs #1594

(cherry picked from commit 69b32f59)

Cherry-picked from [82ca50d3]

Regression was introduced in [3033a3df]

Manually picked from [f2fe0dac]
[ae8638cb]
and [4bacba8c]

Fix GnuTLS compilation by backporting our fixes from trunk including the addition of a native opencdk

There is no difference to svn's HEAD. Additionally, svn access is currently blocked.