Define SO_PROTOCOL and SO_DOMAIN on OpenBSD.

This follows the definitions [here].

[here]: https://github.com/openbsd/src/blob/c5ac8393b86d7549b2b878fd46deeb0e8ee06ae0/sys/sys/socket.h#L116

Author: sunfishcode

libc-test/semver/openbsd.txt

@@ -778,8 +778,10 @@ SOCK_RAW
 SOCK_RDM
 SOMAXCONN
 SO_BINDANY
+SO_DOMAIN
 SO_NETPROC
 SO_PEERCRED
+SO_PROTOCOL
 SO_RTABLE
 SO_SPLICE
 SO_TIMESTAMP

src/unix/bsd/netbsdlike/openbsd/mod.rs

@@ -999,6 +999,8 @@ pub const SO_NETPROC: ::c_int = 0x1020;
 pub const SO_RTABLE: ::c_int = 0x1021;
 pub const SO_PEERCRED: ::c_int = 0x1022;
 pub const SO_SPLICE: ::c_int = 0x1023;
+pub const SO_DOMAIN: ::c_int = 0x1024;
+pub const SO_PROTOCOL: ::c_int = 0x1025;
 
 // sys/netinet/in.h
 // Protocols (RFC 1700)