posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/test/regress_dns.c

Index: third_party/libevent/test/regress_dns.c
diff --git a/third_party/libevent/test/regress_dns.c b/third_party/libevent/test/regress_dns.c
index 8191192cbc2198511842f4c1b0142a002672e8e9..129cdad498f339a6a3f30ace628d097f9197451e 100644
--- a/third_party/libevent/test/regress_dns.c
+++ b/third_party/libevent/test/regress_dns.c
@@ -42,7 +42,7 @@
 #include <sys/queue.h>
 #ifndef WIN32
 #include <sys/socket.h>
-#include <sys/signal.h>
+#include <signal.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>
@@ -89,7 +89,7 @@ dns_gethostbyname_cb(int result, char type, int count, int ttl,
 
 	switch (type) {
 	case DNS_IPv6_AAAA: {
-#if defined(HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP)
+#if defined(HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP) && defined(INET6_ADDRSTRLEN)
 		struct in6_addr *in6_addrs = addresses;
 		char buf[INET6_ADDRSTRLEN+1];
 		int i;
@@ -258,7 +258,7 @@ dns_server_gethostbyname_cb(int result, char type, int count, int ttl,
 		break;
 	}
 	case DNS_IPv6_AAAA: {
-#if defined (HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP)
+#if defined (HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP) && defined(INET6_ADDRSTRLEN)
 		struct in6_addr *in6_addrs = addresses;
 		char buf[INET6_ADDRSTRLEN+1];
 		if (memcmp(&in6_addrs[0].s6_addr, "abcdefghijklmnop", 16)