SDL: Added note for migrating SDL2 code using SDL_ThreadID()

SDL Commits
1 
From becd08f37633a20748e0c8607f468163b8525e8b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 29 Dec 2025 09:39:59 -0800
Subject: [PATCH] Added note for migrating SDL2 code using SDL_ThreadID()

---
 include/SDL3/SDL_oldnames.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/SDL3/SDL_oldnames.h b/include/SDL3/SDL_oldnames.h
index c93607e3f41bc..733f93e13fc2a 100644
--- a/include/SDL3/SDL_oldnames.h
+++ b/include/SDL3/SDL_oldnames.h
@@ -651,6 +651,7 @@
 #define SDL_TLSGet SDL_GetTLS
 #define SDL_TLSSet SDL_SetTLS
 #define SDL_threadID SDL_ThreadID
+#define SDL_ThreadID() SDL_GetCurrentThreadID()
 
 /* ##SDL_timer.h */
 #define SDL_GetTicks64 SDL_GetTicks
@@ -1295,6 +1296,7 @@
 #define SDL_TLSGet SDL_TLSGet_renamed_SDL_GetTLS
 #define SDL_TLSSet SDL_TLSSet_renamed_SDL_SetTLS
 #define SDL_threadID SDL_threadID_renamed_SDL_ThreadID
+#define SDL_ThreadID() SDL_ThreadID_renamed_SDL_GetCurrentThreadID()
 
 /* ##SDL_timer.h */
 #define SDL_GetTicks64 SDL_GetTicks64_renamed_SDL_GetTicks