Ruby » Ruby master

• io.c (validate_enc_binmode, prep_stdio): default to text mode on
  dosish platforms. [ruby-core:38822] [Bug #5164]
• transcode.c (rb_econv_prepare_options): keep default ecflags
  unchanged if no options.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@33165 b2dd03c8-39d4-4d8f-98ff-823fe69b080e