SDL: dlopennote: don't define SDL_ELF_NOTE_DLOPEN when variadic macro's are not supported

SDL Commits
1 
From 58f534708eb29ef01b9469ea5261bd903b8d14dd Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Tue, 14 Oct 2025 20:24:53 +0200
Subject: [PATCH] dlopennote: don't define SDL_ELF_NOTE_DLOPEN when variadic
 macro's are not supported

Guard with #ifdef SDL_ELF_NOTE_DLOPEN when using older toolchains
---
 include/SDL3/SDL_dlopennote.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/SDL3/SDL_dlopennote.h b/include/SDL3/SDL_dlopennote.h
index db54e4ecb809e..765b2707ddad8 100644
--- a/include/SDL3/SDL_dlopennote.h
+++ b/include/SDL3/SDL_dlopennote.h
@@ -173,7 +173,7 @@
 #define SDL_DLNOTE_UNIQUE_NAME SDL_DLNOTE_JOIN(s_SDL_dlopen_note_, __LINE__)
 
 /**
- * Note that your application has dynamic shared library dependencies.
+ * Add a note that your application has dynamic shared library dependencies.
  *
  * You can do this by adding the following to the global scope:
  *
@@ -198,6 +198,8 @@
  * );
  * ```
  *
+ * This macro is not available for compilers that do not support variadic macro's.
+ *
  * \since This macro is available since SDL 3.4.0.
  *
  * \sa SDL_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED
@@ -219,7 +221,6 @@
 #elif defined(_MSC_VER) && _MSC_VER < 1400
 
 /* Variadic macros are not supported */
-#define SDL_ELF_NOTE_DLOPEN
 
 #else