cmake: bump CMake policy compatibilty version

CMakeLists.txt

@@ -5,7 +5,7 @@ endif()
 # MSVC runtime library flags are selected by an abstraction.
 set(CMAKE_POLICY_DEFAULT_CMP0091 NEW)
 
-cmake_minimum_required(VERSION 3.0.0...3.10)
+cmake_minimum_required(VERSION 3.0.0...4.0)
 project(SDL2 C)
 
 if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)

test/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0...3.10)
+cmake_minimum_required(VERSION 3.0...4.0)
 project(SDL2_test C)
 
 include(CheckCCompilerFlag)