SDL: cmake: append to CMAKE_MODULE_PATH instead of overwriting

SDL Commits
1 
From 70214ed3edba941cc0c0aadf0f435dc36fd29d08 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 17 Jun 2022 02:58:45 +0200
Subject: [PATCH] cmake: append to CMAKE_MODULE_PATH instead of overwriting

---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30a224ca3b6..59ec6bfb851 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,7 +68,8 @@ include(CMakeDependentOption)
 include(CMakePushCheckState)
 include(FindPkgConfig)
 include(GNUInstallDirs)
-set(CMAKE_MODULE_PATH "${SDL2_SOURCE_DIR}/cmake")
+
+list(APPEND CMAKE_MODULE_PATH "${SDL2_SOURCE_DIR}/cmake")
 include(${SDL2_SOURCE_DIR}/cmake/macros.cmake)
 include(${SDL2_SOURCE_DIR}/cmake/sdlchecks.cmake)