setup-sdl: Dont add 2 to SDL2_compat prefix

SDL Commits
1 
From f0131347757b3b78ed886b7f0c36b19e26aa2937 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 16 May 2025 21:52:36 +0200
Subject: [PATCH] Dont add 2 to SDL2_compat prefix

---
 packed/index.js | 2 +-
 src/version.ts  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packed/index.js b/packed/index.js
index 13077e1..d0a378d 100644
--- a/packed/index.js
+++ b/packed/index.js
@@ -1810,7 +1810,7 @@ exports.project_descriptions = (_a = {},
     },
     _a[Project.SDL2_compat] = {
         option_name: "version-sdl2-compat",
-        cmake_var_out_prefix: "SDL2",
+        cmake_var_out_prefix: "SDL",
         cmake_var_out_suffix: "_ROOT",
         deps: [Project.SDL],
         major_define: "SDL_MAJOR_VERSION",
diff --git a/src/version.ts b/src/version.ts
index d581312..d297852 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -383,7 +383,7 @@ export const project_descriptions: { [key in Project]: ProjectDescription } = {
   },
   [Project.SDL2_compat]: {
     option_name: "version-sdl2-compat",
-    cmake_var_out_prefix: "SDL2",
+    cmake_var_out_prefix: "SDL",
     cmake_var_out_suffix: "_ROOT",
     deps: [Project.SDL],
     major_define: "SDL_MAJOR_VERSION",