POSIX says IPPORT_RESERVED is in <netdb.h>.

In <netdb.h>:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netdb.h.html

Not in <netinet/in.h>:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html

Change-Id: Ie34cdb80eeb1443cf292944f3c68d8383aee2295
diff --git a/libc/include/netdb.h b/libc/include/netdb.h
index 7fcb11f..95f0986 100644
--- a/libc/include/netdb.h
+++ b/libc/include/netdb.h
@@ -192,6 +192,8 @@
  */
 #define	SCOPE_DELIMITER	'%'
 
+#define IPPORT_RESERVED 1024
+
 __BEGIN_DECLS
 
 /* BIONIC-BEGIN */