What's new:
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What changed:
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- Improve /proc/<PID>/cmdline and /proc/<PID>/stat handling to allow
  all processes access to basic process information of foreign processes.


Bug Fixes
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- Fix access to process list
  Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00253.html

- Fix acl_to_text/acl_to_any_text returning EINVAL on empty acl
  Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00157.html