Remove Encoding#base_encoding

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In message “Re: [ruby-dev:36270] remove Encoding#base_encoding”
on Fri, 12 Sep 2008 03:21:28 +0900, “NARUSE, Yui”
[email protected] writes:

|Encoding#base_encoding e$B$G$9$,!"$3$l:o=|$7$^$;$s$+!#e(B
|
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