SDL: look for clock_gettime() in libc first, then in librt if not found.

SDL Commits
#1 
From c6792f78df9807cd30b95365df40c0524a5f122c Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 13 Feb 2023 21:47:14 +0300
Subject: [PATCH] look for clock_gettime() in libc first, then in librt if not
 found.

---
 CMakeLists.txt | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b1c226b67cf2..26fd4a9f6dd1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1612,14 +1612,14 @@ elseif(UNIX AND NOT APPLE AND NOT RISCOS AND NOT HAIKU)
   CheckPTHREAD()
 
   if(SDL_CLOCK_GETTIME)
-    check_library_exists(rt clock_gettime "" FOUND_CLOCK_GETTIME_LIBRT)
-    if(FOUND_CLOCK_GETTIME_LIBRT)
-      list(APPEND SDL_EXTRA_LIBS rt)
+    check_library_exists(c clock_gettime "" FOUND_CLOCK_GETTIME_LIBC)
+    if(FOUND_CLOCK_GETTIME_LIBC)
       set(HAVE_CLOCK_GETTIME 1)
     else()
-      check_library_exists(c clock_gettime "" FOUND_CLOCK_GETTIME_LIBC)
-      if(FOUND_CLOCK_GETTIME_LIBC)
+      check_library_exists(rt clock_gettime "" FOUND_CLOCK_GETTIME_LIBRT)
+      if(FOUND_CLOCK_GETTIME_LIBRT)
         set(HAVE_CLOCK_GETTIME 1)
+        list(APPEND SDL_EXTRA_LIBS rt)
       endif()
     endif()
   endif()