sse: remove unused HAVE_SSE files
sse: remove unused HAVE_SSE files

There are no sse functions which use these files. Cleans up spurious
warnings when building with --disable-sse2

Change-Id: I04d84b8b7ecfe6da7d5d4df63840796c7b04c085

ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx