SDL: fixed os/2 mouse relative motion not working (thanks Andrey Vasilkin,)

SDL Commits
1 
From b1324fbc9f23c2be21f923e34f4dda690ed578fa Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 5 Jun 2023 11:50:50 +0300
Subject: [PATCH] fixed os/2 mouse relative motion not working (thanks Andrey
 Vasilkin,)

for issue reported at https://github.com/bitwiseworks/SDL2-os2/issues/5
---
 src/video/os2/SDL_os2mouse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/video/os2/SDL_os2mouse.c b/src/video/os2/SDL_os2mouse.c
index 869420c9a7bf..bcbb4b40366f 100644
--- a/src/video/os2/SDL_os2mouse.c
+++ b/src/video/os2/SDL_os2mouse.c
@@ -126,6 +126,8 @@ static void OS2_WarpMouse(SDL_Window * window, int x, int y)
     WinMapWindowPoints(pWinData->hwnd, HWND_DESKTOP, &pointl, 1);
 /*  pWinData->lSkipWMMouseMove++; ???*/
     WinSetPointerPos(HWND_DESKTOP, pointl.x, pointl.y);
+
+    SDL_SendMouseMotion(window, SDL_GetMouse()->mouseID, 0, x, y);
 }
 
 static int OS2_WarpMouseGlobal(int x, int y)