[newlib-cygwin] Cygwin: document bugfix for USB CDC devices

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=bd4bed1254672ac51ca0af0e7720f98c60626d56

commit bd4bed1254672ac51ca0af0e7720f98c60626d56
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Nov 11 13:09:45 2022 +0100

    Cygwin: document bugfix for USB CDC devices
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/release/3.4.0 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/winsup/cygwin/release/3.4.0 b/winsup/cygwin/release/3.4.0
index 8dc6ffe00..bb1495f62 100644
--- a/winsup/cygwin/release/3.4.0
+++ b/winsup/cygwin/release/3.4.0
@@ -42,3 +42,6 @@ Bug Fixes
 
 - Don't error out if getfacl(1) is called on a socket file.
   Partially addresses: https://cygwin.com/pipermail/cygwin/2022-July/251768.html
+
+- Make serial ioctl(TIOCMBIS/TIOCMBIC) work on USB CDC devices.
+  Addresses: https://cygwin.com/pipermail/cygwin/2022-November/252443.html