Maintain pointer to end of AVFormatContext.packet_buffer list
This changes add_to_pktbuf() to maintain a pointer to the last entry in the list, avoiding a linear walk-through on each call. Before this change, add_to_pktbuf() could take a significant amount of time (10% of total decoding time), even with input files of several minutes. After the change, the time spent in this function is barely measurable with oprofile. Originally committed as revision 14654 to svn://svn.ffmpeg.org/ffmpeg/trunk
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