irb_info codepage mismatch

`chcp` returns different encoding

Author: YO4

lib/irb/cmd/info.rb

@@ -18,7 +18,7 @@ def inspect
             str += "LC_ALL env: #{ENV["LC_ALL"]}\n" if ENV["LC_ALL"] && !ENV["LC_ALL"].empty?
             str += "East Asian Ambiguous Width: #{Reline.ambiguous_width.inspect}\n"
             if RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/
-              codepage = `chcp`.sub(/.*: (\d+)\n/, '\1')
+              codepage = `chcp`.b.sub(/.*: (\d+)\n/, '\1')
               str += "Code page: #{codepage}\n"
             end
             str