runtime: Fix netbsd/arm and freebsd/arm build

        The ARM external linking CL left missed changes to sys_freebsd_arm.s and sys_netbsd_arm.s already done to sys_linux_arm.s.

R=rsc
CC=golang-dev
https://codereview.appspot.com/12842044

Committer: Russ Cox <rsc@golang.org>
net: make TestDeadlineRace shorter
1. Do less iterations in short mode
2. Bound number of times SetDeadline is executed

R=golang-dev, rsc
CC=golang-dev
https://codereview.appspot.com/12937043