SDL: windowsrawinput: Add missing WIN_SetRawKeyboardFlag_Inputsink stub.

SDL Commits
1 
From 00f9a2587975d0fcf9508e5083dd79116e9f4f8d Mon Sep 17 00:00:00 2001
From: William Horvath <[EMAIL REDACTED]>
Date: Fri, 20 Mar 2026 06:18:32 -0700
Subject: [PATCH] windowsrawinput: Add missing WIN_SetRawKeyboardFlag_Inputsink
 stub.

---
 src/video/windows/SDL_windowsrawinput.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/video/windows/SDL_windowsrawinput.c b/src/video/windows/SDL_windowsrawinput.c
index 5ae2f51d2375e..53b06389cc177 100644
--- a/src/video/windows/SDL_windowsrawinput.c
+++ b/src/video/windows/SDL_windowsrawinput.c
@@ -334,6 +334,11 @@ bool WIN_SetRawKeyboardFlag_NoHotkeys(SDL_VideoDevice *_this, bool enabled)
     return SDL_Unsupported();
 }
 
+bool WIN_SetRawKeyboardFlag_Inputsink(SDL_VideoDevice *_this, bool enabled)
+{
+    return SDL_Unsupported();
+}
+
 #endif // !SDL_PLATFORM_XBOXONE && !SDL_PLATFORM_XBOXSERIES
 
 #endif // SDL_VIDEO_DRIVER_WINDOWS