posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/config.h.in

Index: third_party/libevent/config.h.in
diff --git a/third_party/libevent/config.h.in b/third_party/libevent/config.h.in
index 4c8be099bf592581a9e903822ab9536d5eca2d1e..149942c11bf8349b09af499919b5e2b3ab77efde 100644
--- a/third_party/libevent/config.h.in
+++ b/third_party/libevent/config.h.in
@@ -30,9 +30,18 @@
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H
 
+/* Define to 1 if the system has the type `fd_mask'. */
+#undef HAVE_FD_MASK
+
 /* Define to 1 if you have the `getaddrinfo' function. */
 #undef HAVE_GETADDRINFO
 
+/* Define to 1 if you have the `getegid' function. */
+#undef HAVE_GETEGID
+
+/* Define to 1 if you have the `geteuid' function. */
+#undef HAVE_GETEUID
+
 /* Define to 1 if you have the `getnameinfo' function. */
 #undef HAVE_GETNAMEINFO
 
@@ -45,6 +54,9 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if you have the `issetugid' function. */
+#undef HAVE_ISSETUGID
+
 /* Define to 1 if you have the `kqueue' function. */
 #undef HAVE_KQUEUE