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Fix Reline::Unicode.calculate_width when input is not a TTY
This fixes an error when output is redirected: ``` $ run_ruby -rreline -e '$stderr.puts Reline::Unicode.calculate_width("\u221a").inspect' </dev/null >/dev/null /home/jeremy/tmp/ruby/lib/reline/ansi.rb:189:in `raw': Operation not supported by device (Errno::ENODEV) ``` The @@encoding -> defined?(@@encoding) changes is necessary because without that part of the commit, the following error would be raised by the above command: ``` /home/jeremy/tmp/reline/lib/reline/general_io.rb:10:in `encoding': uninitialized class variable @@encoding in Reline::GeneralIO (NameError) ``` Problem reported and initial patch for Windows provided by Richard Sharman. I tested this only on OpenBSD, but hopefully it works for other operating systems. Fixes [Bug #17493]
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