1.a) There is only one call to SvTokenStream::SetCharSet
2.b) That call is from SvTokenStream::InitCtor and the argument is
   gsl_getSystemTextEncoding()

2.a) SvTokenStream::SetCharSet is the sole caller of SvChar::GetTable
   i.e.
   pCharTab = SvChar::GetTable( nSet, gsl_getSystemTextEncoding() );
2.b) so this is in practive only ever...
   pCharTab = SvChar::GetTable( gsl_getSystemTextEncoding(),
        gsl_getSystemTextEncoding() );

3) SvChar::GetTable returns a table for converting from one encoding to
   another.

4) so the whole thing is a no-op, i.e.
   pCharTab can be dropped
   SvChar::GetTable is then unused and can be dropped
   SetCharSet and GetCharSet are then also unused