SDL_image: Fixed build when PNG_USES_IMAGEIO is defined

SDL Commits
1 
From 96e1c957a099669202a6775a3f5a616d78a1d855 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 5 Jan 2026 15:09:25 -0800
Subject: [PATCH] Fixed build when PNG_USES_IMAGEIO is defined

---
 src/IMG_png.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/IMG_png.c b/src/IMG_png.c
index 053efb9e..d87ecbad 100644
--- a/src/IMG_png.c
+++ b/src/IMG_png.c
@@ -64,7 +64,7 @@ SDL_Surface *IMG_LoadPNG_IO(SDL_IOStream *src)
     return SDL_LoadPNG_IO(src, false);
 }
 
-#else
+#elif !defined(PNG_USES_IMAGEIO)
 
 /* See if an image is contained in a data source */
 bool IMG_isPNG(SDL_IOStream *src)