Make the spec's handling of LAST1/LAST2 for INTER_4MV mode when not all the  luma blocks are coded match the source code. I don't know why they diverged, but it makes no sense to use (0,0) for one of  the last MV's, since there's special MB modes dedicated to that value already.
Make the spec's handling of LAST1/LAST2 for INTER_4MV mode when not all the
 luma blocks are coded match the source code.
I don't know why they diverged, but it makes no sense to use (0,0) for one of
 the last MV's, since there's special MB modes dedicated to that value already.


git-svn-id: 8dbf393e6e9ab8d4979d29f9a341a98016792aa6@14386 0101bb08-14d6-0310-b084-bc0e0c8e3800

KTXSoftware/theora,Distrotech/libtheora,KTXSoftware/theora,Distrotech/libtheora,KTXSoftware/theora,Distrotech/libtheora,KTXSoftware/theora,Distrotech/libtheora,Distrotech/libtheora,KTXSoftware/theora