configure: test -m(mmx|sse|sse2|sse3) flags
configure: test -m(mmx|sse|sse2|sse3) flags

<=sse2 isn't strictly necessary on x86_64, but this is more consistent
with the rest of the flags and should be harmless

Change-Id: Ice0f1d1c4c7510ee90af2a62dbd3d6508db63487

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vpx,liqianggao/libvpx,smarter/aom,smarter/aom,Distrotech/libvpx,luctrudeau/aom,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,hsueceumd/test_hui,Maria1099/webm.libvpx,jacklicn/webm.libvpx,reimaginemedia/webm.libvpx,lyx2014/libvpx_c,Topopiccione/libvpx,Laknot/libvpx,shyamalschandra/libvpx,shareefalis/libvpx,pcwalton/libvpx,shareefalis/libvpx,ittiamvpx/libvpx,lyx2014/libvpx_c,luctrudeau/aom,shyamalschandra/libvpx,shareefalis/libvpx