Auto merge of #3377 - taiki-e:netbsd-nosigpipe, r=JohnTitor

netbsd: Add SO_NOSIGPIPE

man: https://man.netbsd.org/setsockopt.2
definition: https://github.com/NetBSD/src/blob/0ad34d8ea3dfe0d551b6e33bbff3b81134c100bb/sys/sys/socket.h#L132

Author: bors

libc-test/semver/netbsd.txt

@@ -957,6 +957,7 @@ SOCK_RDM
 SOMAXCONN
 SO_ACCEPTFILTER
 SO_NOHEADER
+SO_NOSIGPIPE
 SO_OVERFLOWED
 SO_REUSEPORT
 SO_TIMESTAMP

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

@@ -1527,6 +1527,7 @@ pub const SOCK_FLAGS_MASK: ::c_int = 0xf0000000;
 
 pub const SO_SNDTIMEO: ::c_int = 0x100b;
 pub const SO_RCVTIMEO: ::c_int = 0x100c;
+pub const SO_NOSIGPIPE: ::c_int = 0x0800;
 pub const SO_ACCEPTFILTER: ::c_int = 0x1000;
 pub const SO_TIMESTAMP: ::c_int = 0x2000;
 pub const SO_OVERFLOWED: ::c_int = 0x1009;