IO.popen on windows should set $?
---------------------------------

                 Key: JRUBY-4901
                 URL: http://jira.codehaus.org/browse/JRUBY-4901
             Project: JRuby
          Issue Type: Improvement
         Environment: jruby 1.6.0.dev (ruby 1.8.7 patchlevel 249) (2010-06-21 
674b9df) (Java HotSpot(TM) Client VM 1.6.0_18) [x86-java]
            Reporter: Roger Pack
            Assignee: Thomas E Enebo
            Priority: Minor


jruby:

irb(main):005:0> IO.popen 'ls'
=> #<IO:0x98350a>
irb(main):006:0> $?
=> nil

MRI 1.9:

irb(main):001:0> IO.popen 'ls'
=> #<IO:0x1eb9840>
irb(main):002:0> $?
=> #<Process::Status: pid 240 exit 0>

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