sdl12-compat: cmake: find SDL2 using find_package

SDL Commits
1 
From 90c4b0f38fff3070fec04ca747ecb9869b533b66 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Tue, 27 Sep 2022 03:32:42 +0200
Subject: [PATCH] cmake: find SDL2 using find_package

---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b3400d78..c3ca347a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,10 @@ if(STATICDEVEL AND NOT (CMAKE_SYSTEM_NAME MATCHES "Linux"))
   MESSAGE(FATAL_ERROR "Static builds are only supported on Linux.")
 endif()
 
+list(APPEND CMAKE_MODULE_PATH
+    "${CMAKE_CURRENT_LIST_DIR}/cmake/modules"
+)
+
 include(CheckCSourceCompiles)
 include(CheckIncludeFile)
 include(CheckCCompilerFlag)
@@ -48,7 +52,10 @@ set(SDL12COMPAT_SRCS
 )
 add_library(SDL SHARED ${SDL12COMPAT_SRCS})
 
-include("cmake/modules/FindSDL2.cmake")
+find_package(SDL2)
+if(NOT SDL2_INCLUDE_DIRS)
+  message(FATAL_ERROR "Could not find SDL2 headers")
+endif()
 target_include_directories(SDL PRIVATE ${SDL2_INCLUDE_DIRS})
 
 set(EXTRA_CFLAGS )