AK: Simplify usage of windows.h and winsock2.h

Use <AK/Windows.h> instead of windows.h/winsock2.h
to avoid timeval-related errors.

Note: winsock2.h includes windows.h

Libraries/LibCore/EventLoopImplementationWindows.cpp

@@ -8,8 +8,8 @@
 #include <LibCore/EventLoopImplementationWindows.h>
 #include <LibCore/Notifier.h>
 #include <LibCore/ThreadEventQueue.h>
-#include <WinSock2.h>
-#include <io.h>
+
+#include <AK/Windows.h>
 
 struct Handle {
     HANDLE handle = NULL;