sdl12-compat: cmake: attempt to fix the stupid OPENGL_FOUND issue

From d2d8f9261d4e5afd00f2af394d4e64aa813ef09b Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 14 Jun 2021 03:01:10 +0300
Subject: [PATCH] cmake: attempt to fix the stupid OPENGL_FOUND issue

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f7f0169..ff38cc4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -96,6 +96,9 @@ if(SDL12TESTS)
     endif()
 
     find_package(OpenGL COMPONENTS OpenGL)
+    if(OpenGL_FOUND)
+      set(OPENGL_FOUND 1)
+    endif()
     if(OPENGL_FOUND)
       set(HAVE_OPENGL_DEFINE "HAVE_OPENGL")
       if(WIN32)