Add CC_DLL for related network files

cocos/network/HttpClient.h

@@ -44,7 +44,7 @@ namespace network {
 /** @brief Singleton that handles asynchrounous http requests
  * Once the request completed, a callback will issued in main thread when it provided during make request
  */
-class HttpClient
+class CC_DLL HttpClient
 {
 public:
     /** Return the shared instance **/

cocos/network/HttpRequest.h

@@ -54,7 +54,7 @@ typedef void (cocos2d::Ref::*SEL_HttpResponse)(HttpClient* client, HttpResponse*
 #endif
 #endif
 
-class HttpRequest : public Ref
+class CC_DLL HttpRequest : public Ref
 {
 public:
     /** Use this enum type as param in setReqeustType(param) */

cocos/network/HttpResponse.h

@@ -37,7 +37,7 @@ namespace network {
  Please refer to samples/TestCpp/Classes/ExtensionTest/NetworkTest/HttpClientTest.cpp as a sample
  @since v2.0.2
  */
-class HttpResponse : public cocos2d::Ref
+class CC_DLL HttpResponse : public cocos2d::Ref
 {
 public:
     /** Constructor, it's used by HttpClient internal, users don't need to create HttpResponse manually

cocos/network/SocketIO.h

@@ -75,7 +75,7 @@ class SIOClient;
 /**
  *  @brief Singleton and wrapper class to provide static creation method as well as registry of all sockets
  */
-class SocketIO
+class CC_DLL SocketIO
 {
 public:
     static SocketIO* getInstance();
@@ -131,7 +131,7 @@ typedef std::unordered_map<std::string, SIOEvent> EventRegistry;
 /**
      *  @brief A single connection to a socket.io endpoint
      */
-class SIOClient
+class CC_DLL SIOClient
     : public cocos2d::Ref
 {
 private:

cocos/network/WebSocket.h

@@ -47,7 +47,7 @@ namespace network {
 class WsThreadHelper;
 class WsMessage;
 
-class WebSocket
+class CC_DLL WebSocket
 {
 public:
     /**