NetBSD: Remove IFF_NOTRAILERS

Upstream commit: NetBSD/src@091e152

(backport <#4782>)
(cherry picked from commit 35d5592)

Author: tgross35

libc-test/semver/netbsd.txt

@@ -416,7 +416,6 @@ IFF_LINK2
 IFF_LOOPBACK
 IFF_MULTICAST
 IFF_NOARP
-IFF_NOTRAILERS
 IFF_OACTIVE
 IFF_POINTOPOINT
 IFF_PROMISC

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

@@ -1118,7 +1118,6 @@ pub const IFF_BROADCAST: c_int = 0x0002; // broadcast address valid
 pub const IFF_DEBUG: c_int = 0x0004; // turn on debugging
 pub const IFF_LOOPBACK: c_int = 0x0008; // is a loopback net
 pub const IFF_POINTOPOINT: c_int = 0x0010; // interface is point-to-point link
-pub const IFF_NOTRAILERS: c_int = 0x0020; // avoid use of trailers
 pub const IFF_RUNNING: c_int = 0x0040; // resources allocated
 pub const IFF_NOARP: c_int = 0x0080; // no address resolution protocol
 pub const IFF_PROMISC: c_int = 0x0100; // receive all packets