[newlib-cygwin] Document pthread_cond_wait change in release notes

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=eed33fa2c4687bc6b4e800d56034095b2ca2c1e4

commit eed33fa2c4687bc6b4e800d56034095b2ca2c1e4
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Mar 7 15:18:03 2017 +0100

    Document pthread_cond_wait change in release notes
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/release/2.7.1 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/winsup/cygwin/release/2.7.1 b/winsup/cygwin/release/2.7.1
index 411a0ae..9657e1d 100644
--- a/winsup/cygwin/release/2.7.1
+++ b/winsup/cygwin/release/2.7.1
@@ -10,6 +10,9 @@ What changed:
 
 - fork now preserves the load order of unrelated dlopen'd modules.
 
+- pthread_cond_wait now acts like Linux and BSD: Resume waiting for the
+  condition variable as if it was not interrupted, rather than returning 0.
+
 
 Bug Fixes
 ---------