Fix build with --enable-ladspa --disable-frei0r.

https://bugs.gentoo.org/show_bug.cgi?id=510516

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/h264_picture: Fix build without error resilience

Found-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>