SDL: Fix building with the steamrt/scout SDK (64d4b)

SDL Commits
1 
From 64d4baccb5e36bd6999cadc54251467d7acb6308 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 19 Jan 2024 22:27:59 -0800
Subject: [PATCH] Fix building with the steamrt/scout SDK

(cherry picked from commit b552f26e6a37dc5a911d1876ce60d8aae3c85e9f)
---
 src/video/kmsdrm/SDL_kmsdrmvideo.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.h b/src/video/kmsdrm/SDL_kmsdrmvideo.h
index c9222f81a55e3..1f7796496e0e4 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.h
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.h
@@ -33,6 +33,20 @@
 #include <gbm.h>
 #include <EGL/egl.h>
 
+#ifndef DRM_CAP_CURSOR_WIDTH
+#define DRM_CAP_CURSOR_WIDTH    8
+#endif
+#ifndef DRM_CAP_CURSOR_HEIGHT
+#define DRM_CAP_CURSOR_HEIGHT   9
+#endif
+
+#ifndef GBM_FORMAT_ARGB8888
+#define GBM_FORMAT_ARGB8888  ((uint32_t)('A') | ((uint32_t)('R') << 8) | ((uint32_t)('2') << 16) | ((uint32_t)('4') << 24))
+#define GBM_BO_USE_CURSOR   (1 << 1)
+#define GBM_BO_USE_WRITE    (1 << 3)
+#define GBM_BO_USE_LINEAR   (1 << 4)
+#endif
+
 typedef struct SDL_VideoData
 {
     int devindex;     /* device index that was passed on creation */