os: adjust test: /bin is a symlink, not a directory, on Solaris.
os: adjust test: /bin is a symlink, not a directory, on Solaris.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4239066
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go