Fix 'include' errors

src/server/WFMySQLServer.cc

@@ -16,6 +16,7 @@
   Authors: Wu Jiaxu (wujiaxu@sogou-inc.com)
 */
 
+#include <sys/uio.h>
 #include "WFMySQLServer.h"
 
 WFConnection *WFMySQLServer::new_connection(int accept_fd)

src/server/WFServer.h

@@ -27,7 +27,6 @@
 #include <atomic>
 #include <mutex>
 #include <condition_variable>
-#include "CommScheduler.h"
 #include "WFTaskFactory.h"
 
 struct WFServerParams
@@ -179,7 +178,7 @@ private:
 	std::mutex mutex;
 	std::condition_variable cond;
 
-	CommScheduler *scheduler;
+	class CommScheduler *scheduler;
 };
 
 template<class REQ, class RESP>