[newlib-cygwin] Cygwin: document recent changes

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=1cc07f3a3ea162d5f39ffeea54a74147754d3649

commit 1cc07f3a3ea162d5f39ffeea54a74147754d3649
Author: Ken Brown <kbrown@cornell.edu>
Date:   Wed Jan 29 12:09:49 2020 -0500

    Cygwin: document recent changes

Diff:
---
 winsup/cygwin/release/3.1.3 | 2 ++
 winsup/doc/new-features.xml | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/winsup/cygwin/release/3.1.3 b/winsup/cygwin/release/3.1.3
index f8752ad..06ed1eb 100644
--- a/winsup/cygwin/release/3.1.3
+++ b/winsup/cygwin/release/3.1.3
@@ -11,6 +11,8 @@ What changed:
 - Support the Linux-specific AT_EMPTY_PATH flag for fchownat(2) and
   fstatat(2).
 
+- Allow AF_LOCAL sockets to be opened with O_PATH.
+
 Bug Fixes:
 ----------
 
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml
index 967c64a..78c7760 100644
--- a/winsup/doc/new-features.xml
+++ b/winsup/doc/new-features.xml
@@ -69,6 +69,12 @@ Support the Linux-specific AT_EMPTY_PATH flag for fchownat(2) and
 fstatat(2).
 </para></listitem>
 
+<listitem><para>
+Allow AF_LOCAL sockets to be opened with O_PATH.  If that flag is not
+set, or if an attempt is made to open a different type of socket, the
+errno is now EOPNOTSUPP instead of ENXIO.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>