Fix 'include' errors

src/kernel/IOService_linux.h

@@ -22,6 +22,7 @@
 #include <sys/uio.h>
 #include <sys/eventfd.h>
 #include <stddef.h>
+#include <pthread.h>
 #include "list.h"
 
 #define IOS_STATE_SUCCESS	0

src/kernel/SleepRequest.h

@@ -19,6 +19,7 @@
 #ifndef _SLEEPREQUEST_H_
 #define _SLEEPREQUEST_H_
 
+#include <errno.h>
 #include "SubTask.h"
 #include "Communicator.h"
 #include "CommScheduler.h"

src/kernel/mpoller.h

@@ -19,8 +19,7 @@
 #ifndef _MPOLLER_H_
 #define _MPOLLER_H_
 
-#include <sys/types.h>
-#include <sys/socket.h>
+#include <stddef.h>
 #include "poller.h"
 
 typedef struct __mpoller mpoller_t;