* test/testunit/test_hideskip.rb (test_hideskip): reap zombie by
  reading with IO.popen instead of separated spawn and assert.

* test/testunit/test_redefinition.rb (test_redefinition): ditto.

* test/testunit/test_sorting.rb (test_sorting): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e