Fix Windows build

CMakeLists.txt

@@ -114,7 +114,7 @@ IF (APPLE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++")
 ELSEIF(WIN32)
-    set(PLATFORM_LIBRARIES winmm)
+    set(PLATFORM_LIBRARIES winmm ws2_32)
 ELSE()
     set(PLATFORM_LIBRARIES rt)
 ENDIF (APPLE)