pg_encoding not needed anymore

With initdb written now in C, we don't need a pg_encoding binary
anymore.

I have removed it from CVS.  There were no mentions of it in the docs.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
359-1001+  If your life is a hard drive,     |  13 Roberts Road +  Christ can be your backup.        |  Newtown Square,
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