Fix use of nalu_process callback

Broke after unifying of 8-bit and 10-bit libraries.

The callback still received a pointer to the internal x264_t as the first argument instead of the x264_api_t replacement used after the unifying.

Fixes #27 (closed).

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added 6 commits

• e6eac67e...045d3fda - 5 commits from branch videolan:master
• 544c61f0 - Fix use of nalu_process callback

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merged