graphics/openimageio: unbreak with ffmpeg 4.0

src/ffmpeg.imageio/ffmpeginput.cpp:333:72: error: use of undeclared identifier 'CODEC_CAP_DELAY'

m_codec_cap_delay = (bool) (m_codec_context->codec->capabilities & CODEC_CAP_DELAY);
                                                                   ^

PR: 227726
Obtained from: upstream