SDL: WhatsNew.txt: added line for the calling convention fixes.

From 192ae1e356949e012c2342da9cc5a28b010d7faa Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 21 Jul 2022 17:11:30 +0300
Subject: [PATCH] WhatsNew.txt: added line for the calling convention fixes.

 WhatsNew.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/WhatsNew.txt b/WhatsNew.txt
index c2a402c7908..6827cb1567a 100644
--- a/WhatsNew.txt
+++ b/WhatsNew.txt
@@ -35,6 +35,7 @@ General:
 * Added HIDAPI driver for the NVIDIA SHIELD controller (2017 model) to enable support for battery status and rumble
 * Added support for opening audio devices with 3 or 5 channels (2.1, 4.1). All channel counts from Mono to 7.1 are now supported.
 * Rewrote audio channel converters used by SDL_AudioCVT, based on the channel matrix coefficients used as the default for FAudio voices
+* Fixed a long-standing calling convention issue with dynapi and OpenWatcom or OS/2 builds.
 * Added a D3D12 renderer implementation and SDL_RenderGetD3D12Device() to retrieve the D3D12 device associated with it