Merge pull request #4755 from Orphis/cmake_sdl

cmake: Modernize SDL discovery

CMakeLists.txt

@@ -704,25 +704,6 @@ if(OPENAL_FOUND)
 	endif()
 endif()
 
-if(ENABLE_SDL)
-	find_package(SDL2)
-	if(SDL2_FOUND)
-		message(STATUS "Using shared SDL2")
-		add_definitions(-DHAVE_SDL=1)
-		include_directories(${SDL2_INCLUDE_DIR})
-	else()
-		# SDL2 not found, try SDL
-		find_package(SDL OPTIONAL)
-		if(SDL_FOUND)
-			message(STATUS "Using shared SDL")
-			add_definitions(-DHAVE_SDL=1)
-			include_directories(${SDL_INCLUDE_DIR})
-		else()
-			message(STATUS "SDL NOT found, disabling SDL input")
-		endif()
-	endif()
-endif()
-
 if(NOT ANDROID)
 	add_definitions(-D__LIBUSB__)
 	if(NOT APPLE)