Add changelog

Signed-off-by: Felix Conway <felix.conway@arm.com>
diff --git a/ChangeLog.d/unterminated-string-initialization.txt b/ChangeLog.d/unterminated-string-initialization.txt
new file mode 100644
index 0000000..f412f45
--- /dev/null
+++ b/ChangeLog.d/unterminated-string-initialization.txt
@@ -0,0 +1,5 @@
+Bugfix
+   * GCC 15 introduced the warning 'unterminated-string-initialization', which
+     complains if you initialize a string into an array without space for a
+     terminating null character. This is intentional in many parts of the
+     code, so suppress the warning in these places. Fixes #9944.