Bug Fixes:
----------

- Fix accidental evaluation of NUL (\0) characters in xterm console output.
  Don't move cursor to the right in case of a NUL character in the console
  output stream, this is not backed by terminfo.
  Addresses: https://cygwin.com/ml/cygwin/2020-02/msg00162.html

- Fix a segfault when starting, e.g., mintty from a bash in a console
  running xterm emulation.
  Addresses: https://cygwin.com/ml/cygwin/2020-02/msg00197.html