yuv2rgb_altivec_init_tables does initialize the SwsContext vectors.
missing vec_splat.
patch by (Luca Barbato <lu_zero at gentoo dot org>) and (Romain Dolbeau <dolbeau at irisa dot fr>)


git-svn-id: file:///var/local/repositories/mplayer/trunk/postproc@13565 b3059339-0415-0410-9bf9-f77b7e298cf2