Add NI_* constants from netdb.h for macOS.

Author: reitermarkus

src/unix/bsd/apple/mod.rs

@@ -1914,6 +1914,13 @@ pub const IUTF8: ::tcflag_t = 0x00004000;
 pub const CRTSCTS: ::tcflag_t = 0x00030000;
 
 pub const NI_MAXHOST: ::socklen_t = 1025;
+pub const NI_MAXSERV: ::socklen_t = 32;
+pub const NI_NOFQDN: ::c_int = 0x00000001;
+pub const NI_NUMERICHOST: ::c_int = 0x00000002;
+pub const NI_NAMEREQD: ::c_int = 0x00000004;
+pub const NI_NUMERICSERV: ::c_int = 0x00000008;
+pub const NI_NUMERICSCOPE: ::c_int = 0x00000100;
+pub const NI_DGRAM: ::c_int = 0x00000010;
 
 pub const Q_GETQUOTA: ::c_int = 0x300;
 pub const Q_SETQUOTA: ::c_int = 0x400;