net: enable runtime-integrated network pollster on netbsd

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13080043

src/pkg/net/fd_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd,arm netbsd
+// +build freebsd,arm
 
 // Waiting for FDs via kqueue/kevent.
 

src/pkg/net/fd_poll_runtime.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd,amd64 freebsd,386 linux openbsd windows
+// +build darwin freebsd,amd64 freebsd,386 linux netbsd openbsd windows
 
 package net
 

src/pkg/net/fd_poll_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd,arm netbsd
+// +build freebsd,arm
 
 package net