bash not work with new_console (Win10 16199Insider)

[yyjdelete]

Tested with:
  cygwin: 2.8.0-1
  bash: 4.4.12-3
  win: 10 16199(Insider)

When you type `1234567890(Enter)(Enter)(Enter)`, the bash only get `1470`, and nothing is shown before the third Enter is press.

It work well after switch to legacy console.

[new_console](https://technet.microsoft.com/library/mt427362.aspx)

Also found here: https://github.com/Alexpux/Cygwin/issues/36
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