Update SDL to version 2.0.14.

libs/SDL2/include/SDL_syswm.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -49,6 +49,9 @@ struct SDL_SysWMinfo;
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
+#ifndef NOMINMAX   /* don't define min() and max(). */
+#define NOMINMAX
+#endif
 #include <windows.h>
 #endif
 
@@ -103,6 +106,11 @@ typedef void *EGLSurface;
 #if defined(SDL_VIDEO_DRIVER_VIVANTE)
 #include "SDL_egl.h"
 #endif
+
+#if defined(SDL_VIDEO_DRIVER_OS2)
+#define INCL_WIN
+#include <os2.h>
+#endif
 #endif /* SDL_PROTOTYPES_ONLY */
 
 
@@ -129,7 +137,8 @@ typedef enum
     SDL_SYSWM_WINRT,
     SDL_SYSWM_ANDROID,
     SDL_SYSWM_VIVANTE,
-    SDL_SYSWM_OS2
+    SDL_SYSWM_OS2,
+    SDL_SYSWM_HAIKU
 } SDL_SYSWM_TYPE;
 
 /**
@@ -182,6 +191,16 @@ struct SDL_SysWMmsg
             int dummy;
             /* No Vivante window events yet */
         } vivante;
+#endif
+#if defined(SDL_VIDEO_DRIVER_OS2)
+        struct
+        {
+            BOOL fFrame;                /**< TRUE if hwnd is a frame window */
+            HWND hwnd;                  /**< The window receiving the message */
+            ULONG msg;                  /**< The message identifier */
+            MPARAM mp1;                 /**< The first first message parameter */
+            MPARAM mp2;                 /**< The second first message parameter */
+        } os2;
 #endif
         /* Can't have an empty union */
         int dummy;
@@ -276,6 +295,14 @@ struct SDL_SysWMinfo
         } android;
 #endif
 
+#if defined(SDL_VIDEO_DRIVER_OS2)
+        struct
+        {
+            HWND hwnd;                  /**< The window handle */
+            HWND hwndFrame;             /**< The frame window handle */
+        } os2;
+#endif
+
 #if defined(SDL_VIDEO_DRIVER_VIVANTE)
         struct
         {