useless Encode:: version

The Encode:: xsub call took 25.5 secs (this is best case scenario)
according to nytprof, the encode() call took 32.1 seconds (unoptimized).

The unpack and shift, the unpack() calls took 7.63 secs. Using Encode::
to convert the scalar to hold UTF-32LE data is much slower and useless.

I think Encode:: is very inefficiently written in comparison to what we
want to do.

This commit does pass a make test without any problems.