[newlib-cygwin] cygwin: document wcsxfrm fix

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=41b7ef9e1f6357a382be96341507a460123423df

commit 41b7ef9e1f6357a382be96341507a460123423df
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Jun 6 18:39:41 2017 +0200

    cygwin: document wcsxfrm fix
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/release/2.8.1 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/winsup/cygwin/release/2.8.1 b/winsup/cygwin/release/2.8.1
index c90cd16..9a0ecb7 100644
--- a/winsup/cygwin/release/2.8.1
+++ b/winsup/cygwin/release/2.8.1
@@ -27,3 +27,6 @@ Bug Fixes
 
 - Fix ldd potentially looping on non-continuable exception
   Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00002.html
+
+- Fix buffer overflow problem in wcsxfrm/wcsxfrm_l.
+  Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00149.html