[FFmpeg-cvslog] hwcontext_vaapi: Fix compilation with libva versions < 1.4.0

ffmpeg | branch: release/4.0 | Mark Thompson | Fri Apr 27 13:41:56 2018 +0100| [44cb6474770e6603913cb76e3be4278f663aad3e] | committer: Mark Thompson hwcontext_vaapi: Fix compilation with libva versions < 1.4.0 The BufferHandle API was added in libva 1.4.0 / VAAPI 0.36.0.

[FFmpeg-cvslog] hwcontext_vaapi: Fix compilation with libva versions < 1.4.0

ffmpeg | branch: master | Mark Thompson | Fri Apr 27 13:41:56 2018 +0100| [92a0a6bea9dc3087fa8d232b750db1dd0d70b157] | committer: Mark Thompson hwcontext_vaapi: Fix compilation with libva versions < 1.4.0 The BufferHandle API was added in libva 1.4.0 / VAAPI 0.36.0. >