Auto merge of #3316 - sunfishcode:sunfishcode/openbsd-socket-options, r=JohnTitor

Define `SO_PROTOCOL` and `SO_DOMAIN` on OpenBSD and Solarish.

This follows the definitions [here].

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

Author: bors

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)

src/unix/solarish/mod.rs

@@ -1825,6 +1825,8 @@ pub const SO_SNDTIMEO: ::c_int = 0x1005;
 pub const SO_RCVTIMEO: ::c_int = 0x1006;
 pub const SO_ERROR: ::c_int = 0x1007;
 pub const SO_TYPE: ::c_int = 0x1008;
+pub const SO_PROTOTYPE: ::c_int = 0x1009;
+pub const SO_DOMAIN: ::c_int = 0x100c;
 pub const SO_TIMESTAMP: ::c_int = 0x1013;
 
 pub const SCM_RIGHTS: ::c_int = 0x1010;