Bring back SSE2 support to the aoTuV Ogg Vorbis encoder

[galacticninja]

It seems that with the aoTuV b6.02 release, SSE2 support to the aoTuV Ogg Vorbis encoder is now gone:

http://www.dbpoweramp.com/codec-central-ogg-vorbis.htm

This results in us with CPUs that support up to SSE2 only, being forced to use the slower SSE-encoder. Please put an SSE2 option again.