sdl12-compat: CMakeLists.txt: remove outdated note.

SDL Commits
1 
From cae865f707bea15979b0c69aab5d0bc05a553e7b Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Tue, 25 May 2021 14:02:40 +0300
Subject: [PATCH] CMakeLists.txt: remove outdated note.

---
 CMakeLists.txt | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f664f2c..440a595 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,9 +1,6 @@
 # NOTE:  If you installed SDL2 at an unusual place and FindSDL2 fails,
 #        you can define SDL2_INCLUDE_DIR on the cmdline.  For example:
 #        cmake -DSDL2_INCLUDE_DIR=/opt/SDL2/include/SDL2 [other stuff]
-#
-# NOTE:  To build SDL1.2 test programs enable SDL12TESTS. For example:
-#        cmake -DSDL12TESTS=1 [other stuff]
 
 cmake_minimum_required(VERSION 3.0.0)
 project(sdl12_compat)