Fix SDL2 linkage for Darwin.

src/conio/CMakeLists.txt

@@ -156,6 +156,7 @@ if(NOT WITHOUT_SDL)
 	if(SDL2_FOUND)
 		if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 			target_compile_definitions(ciolib PUBLIC STATIC_SDL)
+			target_link_libraries(ciolib SDL2::SDL2)
 		endif()
 		target_include_directories(ciolib PUBLIC ${SDL2_INCLUDE_DIRS})
 		target_compile_definitions(ciolib PUBLIC WITH_SDL)

src/xpdev/CMakeLists.txt

@@ -221,7 +221,8 @@ endif()
 if(NOT WITHOUT_SDL_AUDIO)
 	if(SDL2_FOUND)
 		if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-			target_compile_definitions(ciolib PUBLIC STATIC_SDL)
+			target_compile_definitions(xpdev PUBLIC STATIC_SDL)
+			target_link_libraries(xpdev SDL2::SDL2})
 		endif()
 		target_include_directories(xpdev PUBLIC ${SDL2_INCLUDE_DIRS})
 		target_compile_definitions(xpdev PUBLIC WITH_SDL_AUDIO)