remove sdl2 for ci tests

CMakeLists.txt

@@ -398,32 +398,6 @@ if(NOT LIBRETRO)
 	endif()
 
 	if(NOT ANDROID AND NOT IOS)
-		if(USE_HOST_SDL)
-			find_package(SDL2 2.0.9)
-		endif()
-		if(NOT SDL2_FOUND)
-			add_subdirectory(core/deps/SDL EXCLUDE_FROM_ALL)
-			set(SDL2_FOUND 1)
-		endif()
-
-		# SDL2::SDL2main may or may not be available. It is e.g. required by Windows GUI applications
-		if(TARGET SDL2::SDL2main)
-			# It has an implicit dependency on SDL2 functions, so it MUST be added before SDL2::SDL2 (or SDL2::SDL2-static)
-			target_link_libraries(${PROJECT_NAME} PRIVATE SDL2::SDL2main)
-		endif()
-
-		if((APPLE OR WIN32) AND TARGET SDL2::SDL2-static)
-			target_link_libraries(${PROJECT_NAME} PRIVATE SDL2::SDL2-static)
-		elseif(TARGET SDL2::SDL2)
-			target_link_libraries(${PROJECT_NAME} PRIVATE SDL2::SDL2)
-		else()
-			target_include_directories(${PROJECT_NAME} PRIVATE ${SDL2_INCLUDE_DIRS})
-			target_link_libraries(${PROJECT_NAME} PRIVATE ${SDL2_LIBRARIES})
-		endif()
-
-		target_compile_definitions(${PROJECT_NAME} PRIVATE USE_SDL USE_SDL_AUDIO)
-		target_sources(${PROJECT_NAME} PRIVATE core/sdl/sdl.cpp core/sdl/sdl.h core/sdl/sdl_gamepad.h core/sdl/sdl_keyboard.h)
-
 		if((UNIX AND NOT APPLE) OR NINTENDO_SWITCH)
 			find_package(CURL REQUIRED)
 			target_link_libraries(${PROJECT_NAME} PRIVATE CURL::libcurl)