Unbreak windows build bot

Commit c28f81797084b8416ff5be4f9e79000a9741ca6a (svn r361079)
broke the windows buildbot. This should fix it.

llvm-svn: 361083

lldb/unittests/Host/SocketTestUtilities.cpp

@@ -8,7 +8,13 @@
 
 #include "SocketTestUtilities.h"
 #include "lldb/Utility/StreamString.h"
+
+#if defined(_WIN32)
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
 #include <arpa/inet.h>
+#endif
 
 using namespace lldb_private;