move zigzag scan functions to dsp function pointers.
mmx implementation of interlaced zigzag. git-svn-id: svn://svn.videolan.org/x264/trunk@571 df754926-b1dd-0310-bc7b-ec298dee348c
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mmx implementation of interlaced zigzag. git-svn-id: svn://svn.videolan.org/x264/trunk@571 df754926-b1dd-0310-bc7b-ec298dee348c