[Bug #2154] filesystem encoding of UNIX

Bug #2154: filesystem encoding of UNIX
http://redmine.ruby-lang.org/issues/show/2154

e$B5/I<<Te(B: Usaku NAKAMURA
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
e$BC4Ev<Te(B: Yui NARUSE, e$B%+%F%4%je(B: M17N, Target version: 1.9.x
ruby -v: ruby 1.9.2dev (2009-09-28 trunk 25132) [i386-mswin32]

e$B!Ve(BRuby M17N
e$B$N@7W$H<BAu!W$K$h$k$He(B(1)e$B!"e(BUNIXe$B$K$$1$ke(Bfilesystem
encodinge$B$Oe(Blocalee$B$G$“$k$H=q$+$l$F$$$k$N$G$9$,!”<B:]$K$O8=:
$Ne(B
e$B<BAu$Oe(Bdefault externale$B$K$J$C$F$$$^$9!#e(B
e$B<BAu$NJ}$,4V0c$C$F$k5$$,$9$k$N$G$9$,!"$I$&$G$7$g$&$+e(B?

*1 http://jp.rubyist.net/magazine/?0025-Ruby19_m17n#l23

e$B%A%1%C%He(B #2154 e$B$,99?7$5$l$^$7$?!#e(B (by Yui NARUSE)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

Applied in changeset r25140.

http://redmine.ruby-lang.org/issues/show/2154