What's new:
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What changed:
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Bug Fixes
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- Fix potential hang in pseudo ttys when generating ECHO output while the slave
  is flooding the pty with output.
  Addresses: https://cygwin.com/ml/cygwin/2015-03/msg00019.html

- Fix potential premature SIGHUP in pty code.
  Addresses: https://cygwin.com/ml/cygwin/2015-03/msg00070.html