Anton Khirnov 350d06d63f lavc: add avcodec_is_open().
It allows to check whether an AVCodecContext is open in a documented
way. Right now the undocumented way this check is done in lavf/lavc is
by checking whether AVCodecContext.codec is NULL. However it's desirable
to be able to set AVCodecContext.codec before avcodec_open2().

(cherry picked from commit af08d9aeea870de017139f7b1c44b7d816cf8e56)

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