Bug Fixes
---------

- Handle SIGHUP in pty master close.
  Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00133.html
	     https://cygwin.com/ml/cygwin/2011-07/msg00295.html

- Avoid fetching /proc process info from non-Cygwin processes.
  Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00133.html
	     https://cygwin.com/ml/cygwin/2015-05/msg00331.html
	     https://cygwin.com/ml/cygwin/2015-05/msg00314.html