Issue 12404: Remove C89 incompatible code from mmap module.

Patch by Akira Kitada.
diff --git a/Misc/NEWS b/Misc/NEWS
index 2e33e7f..bddddfa 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -16,6 +16,9 @@
 Library
 -------
 
+- Issue #12404: Remove C89 incompatible code from mmap module. Patch by Akira
+  Kitada.
+
 - Issue #11700: mailbox proxy object close methods can now be called multiple
   times without error, and _ProxyFile now closes the wrapped file.