Fix more windows.h/winsock.h/winsock2.h issues

We want to use winsock2.h rather than winsock.h. This was mostly enforced
from the global_defines.h file, but I wanted to make it consistent.

Most of these includes can be removed since they're included via
global_defines.h, but someone on windows should clean that up

world/client.cpp

@@ -61,8 +61,8 @@
 
 // Disgrace: for windows compile
 #ifdef _WINDOWS
+	#include <winsock2.h>
 	#include <windows.h>
-	#include <winsock.h>
 #else
 	
 	#ifdef FREEBSD //Timothy Whitman - January 7, 2003

world/login_server.cpp

@@ -25,8 +25,8 @@
 
 #ifdef _WINDOWS
 	#include <process.h>
+	#include <winsock2.h>
 	#include <windows.h>
-	#include <winsock.h>
 
 	#define snprintf	_snprintf
 	#define strncasecmp	_strnicmp

world/net.h

@@ -26,8 +26,8 @@
 #else
 	#include <cerrno>
 	#include <fcntl.h>
+	#include <winsock2.h>
 	#include <windows.h>
-	#include <winsock.h>
 #endif
 
 void CatchSignal(int sig_num);