set up windows build

src/IPStackSimulator.cc

@@ -6,13 +6,7 @@
 #include <event2/buffer.h>
 #include <event2/bufferevent.h>
 #include <event2/listener.h>
-
-#ifndef PHOSG_WINDOWS
 #include <arpa/inet.h>
-#else
-#include <winsock2.h>
-#include <ws2tcpip.h>
-#endif
 
 #include <string>
 #include <phosg/Network.hh>

src/Main.cc

@@ -1086,6 +1086,7 @@ int main(int argc, char** argv) {
           }
         }
 
+#ifndef PHOSG_WINDOWS
         if (!state->ip_stack_addresses.empty()) {
           config_log.info("Starting IP stack simulator");
           ip_stack_simulator.reset(new IPStackSimulator(base, state));
@@ -1094,6 +1095,7 @@ int main(int argc, char** argv) {
             ip_stack_simulator->listen(netloc.first, netloc.second);
           }
         }
+#endif
 
       } else {
         throw logic_error("invalid behavior");