Go back to using GenerateConsoleCtrlEvent for processed-mode Ctrl-C
Go back to using GenerateConsoleCtrlEvent for processed-mode Ctrl-C

This change reverts the first part of the GH-116 fix.

See https://github.com/rprichard/winpty/issues/116

rprichard/winpty,rprichard/winpty,rprichard/winpty,rprichard/winpty