SDL: cmake,os2: fix SDL_TIMER_UNIX -> SDL_TIMER_OS2 typo

SDL Commits
1 
From 595668b7d7c880da0e62f0caf5081047036de75d Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 1 Oct 2026 23:55:40 +0300
Subject: [PATCH] cmake,os2: fix SDL_TIMER_UNIX -> SDL_TIMER_OS2 typo

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0f0618838bda..abe54cb2dc8e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2834,7 +2834,7 @@ elseif(OS2)
   endif()
 
   if(SDL_TIMERS)
-    set(SDL_TIMER_UNIX 1)
+    set(SDL_TIMER_OS2 1)
     file(GLOB OS2_TIMER_SOURCES ${SDL2_SOURCE_DIR}/src/timer/os2/*.c)
     list(APPEND SOURCE_FILES ${OS2_TIMER_SOURCES})
     set(HAVE_SDL_TIMERS TRUE)