amd64 doesn't use the mmx/sse USE flags, so evas' support for these extensions are disabled all the time on amd64. I will attach a patch to forcibly enable mmx/sse on amd64 in the same way as mplayer does it.
Created attachment 89682 [details, diff] Forcibly enable MMX/SSE on amd64.
Created attachment 89684 [details, diff] Fixed patch.. Oops, attached a bad patch. Fixed one attached
no, i'm not going to be forcing mmx/sse based on $ARCH seems i've waited long enough as the amd64 team has started unmasking these USE flags for some packages