libgo: Irix portability fixes (no declaration for getaddrinfo).

From Rainer Orth.

From-SVN: r174145

libgo/syscalls/socket_irix.go

@@ -82,3 +82,44 @@ type IpMreq struct {
 	Multiaddr [4]byte
 	Interface [4]byte
 }
+
+// Similarly, <netdb.h> only provides struct addrinfo, AI_* and EAI_* if
+// _NO_XOPEN4 && _NO_XOPEN5.
+type Addrinfo struct {
+	Ai_flags int32
+	Ai_family int32
+	Ai_socktype int32
+	Ai_protocol int32
+	Ai_addrlen int32
+	Ai_canonname *uint8
+	Ai_addr *_sockaddr
+	Ai_next *Addrinfo
+}
+
+const (
+	AI_PASSIVE	= 0x00000001
+	AI_CANONNAME	= 0x00000002
+	AI_NUMERICHOST	= 0x00000004
+	AI_NUMERICSERV	= 0x00000008
+	AI_ALL		= 0x00000100
+	AI_ADDRCONFIG	= 0x00000400
+	AI_V4MAPPED	= 0x00000800
+	AI_DEFAULT	= (AI_V4MAPPED | AI_ADDRCONFIG)
+)
+
+const (
+	EAI_ADDRFAMILY	=  1
+	EAI_AGAIN	=  2
+	EAI_BADFLAGS	=  3
+	EAI_FAIL	=  4
+	EAI_FAMILY	=  5
+	EAI_MEMORY	=  6
+	EAI_NODATA	=  7
+	EAI_NONAME	=  8
+	EAI_SERVICE	=  9
+	EAI_SOCKTYPE	= 10
+	EAI_SYSTEM	= 11
+	EAI_BADHINTS	= 12
+	EAI_OVERFLOW	= 13
+	EAI_MAX		= 14
+)