ffmpeg: Stage `avconfig.h` which is built at compile time.
ffmpeg: Stage `avconfig.h` which is built at compile time.

This header is needed for `libvalhalla`.

Signed-off-by: Paul Menzel <acd6d3b156327487a919475da61b8867f1e8b249@users.sourceforge.net>
Acked-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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