SDL_image: Do not build the webpmux command line tool

SDL Commits
1 
From b075b819c262cd67eeb58d887b758eeda4535ab2 Mon Sep 17 00:00:00 2001
From: Brenton Bostick <[EMAIL REDACTED]>
Date: Mon, 28 Sep 2026 11:30:51 -0400
Subject: [PATCH] Do not build the webpmux command line tool

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9cec4af29..4f22ed486 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1084,7 +1084,7 @@ if(SDLIMAGE_WEBP)
         set(WEBP_BUILD_VWEBP OFF CACHE BOOL "" FORCE)
         set(WEBP_BUILD_WEBPINFO OFF CACHE BOOL "" FORCE)
         set(WEBP_BUILD_LIBWEBPMUX ON CACHE BOOL "" FORCE)
-        set(WEBP_BUILD_WEBPMUX ON CACHE BOOL "" FORCE)
+        set(WEBP_BUILD_WEBPMUX OFF CACHE BOOL "" FORCE)
         set(WEBP_BUILD_EXTRAS OFF CACHE BOOL "" FORCE)
         message(STATUS "${PROJECT_NAME}: Using vendored libwebp")
         sdl_check_project_in_subfolder(external/libwebp libwebp SDLIMAGE_VENDORED)