AltiVec code needs -maltivec to compile, but then AltiVec instructions
appear in other places of the code causing MPlayer to sigill.
Somehow upstream libmpeg2 manages not to sigill under what appear to be
the same circumstances. Enlightenment welcome.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26657 b3059339-0415-0410-9bf9-f77b7e298cf2