platform: Include stdarg.h where needed
Windows builds also need stdarg.h included when using variadic
functions.
Fixes #2656
diff --git a/ChangeLog b/ChangeLog
index 273d4bc..8667c9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,10 @@
= mbed TLS 2.18.1 branch released 2019-07-12
+Bugfix
+ * Fix build failure when building with mingw on Windows by including
+ stdarg.h where needed. Fixes #2656.
+
Changes
* Enable building of Mbed TLS as a CMake subproject. Suggested and fixed by
Ashley Duncan in #2609.