SDL: Remove #undef __3DS__

From 691a6133d37013b2490a5fe48004d42441b40921 Mon Sep 17 00:00:00 2001
From: Cameron Cawley <[EMAIL REDACTED]>
Date: Tue, 4 Feb 2025 21:51:55 +0000
Subject: [PATCH] Remove #undef __3DS__

---
 include/SDL3/SDL_platform_defines.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/SDL3/SDL_platform_defines.h b/include/SDL3/SDL_platform_defines.h
index 7e9a0a92a28d3..6b240a8be4579 100644
--- a/include/SDL3/SDL_platform_defines.h
+++ b/include/SDL3/SDL_platform_defines.h
@@ -471,8 +471,6 @@
  * \since This macro is available since SDL 3.2.0.
  */
 #define SDL_PLATFORM_3DS 1
-
-#undef __3DS__
 #endif
 
 #endif /* SDL_platform_defines_h_ */