[newlib-cygwin/cygwin-3_6-branch] Cygwin: update release info for 3.6.7.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a23f9f8de81a2d9d364111c5c64eee1ad753c1a3

commit a23f9f8de81a2d9d364111c5c64eee1ad753c1a3
Author:     Corinna Vinschen <corinna@vinschen.de>
AuthorDate: Fri Feb 13 10:59:12 2026 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Fri Feb 13 10:59:19 2026 +0100

    Cygwin: update release info for 3.6.7.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
    (cherry picked from commit 69f09ebd6f7d543f8e7b66ff58f2f3a178834d7f)

Diff:
---
 winsup/cygwin/release/3.6.7 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/release/3.6.7 b/winsup/cygwin/release/3.6.7
index 1ef4e3023e00..32b0732e3eb5 100644
--- a/winsup/cygwin/release/3.6.7
+++ b/winsup/cygwin/release/3.6.7
@@ -1,7 +1,7 @@
 Fixes:
 ------
 
-- Guard c32rtomb against invalid input characters.
+- Guard c32rtomb() against invalid input characters.
   Addresses a testsuite error in current gawk git master.
 
 - Allow changing primary group even when running with cygserver account
@@ -13,3 +13,8 @@ Fixes:
 
 - Fix uid/gid mapping from unix id to Cygwin id in certain scenarios when
   accessing Samba or NFS shares on unixoid OS.
+
+- gencat: Fix a bug in octal value handling in catalog input files.
+  Addresses a flaw in tcsh's cataloge file generation.
+
+- Bump default_POSIX_C_SOURCE to 202405.