test_io_wait.rb: Bug #7420
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37984 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_io_wait.rb: Bug #7420
Errno::EWOULDBLOCK may not be the same as Errno::EAGAIN. patch by
phasis68 (Heesob Park) at [ruby-core:49894]. [Bug #7420]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37984 b2dd03c8-39d4-4d8f-98ff-823fe69b080e