posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/test/test-init.c

 /*
  * Compile with:
  * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
+#ifdef WIN32
+#include <winsock2.h>
+#endif
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
+#endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #include <fcntl.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <errno.h>
 
 #include <event.h>
 
 int
 main(int argc, char **argv)
 {
         /* Initalize the event library */
         event_init();
 
         return (0);
 }