build: Drop syslog on DISABLE_NET_TESTS=1
build: Drop syslog on DISABLE_NET_TESTS=1

Even if local, it requires communication with a daemon
which may not be available.  This is creating problems
for getting an Ubuntu package going in Launchpad's PPA.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/3989062

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

tv42/old-go,apparentlymart/golang,dsriram/golang,ssrl/go,dsriram/golang,ssrl/go,ssrl/go,ssrl/go,ssrl/go,gnanderson/go,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,ssrl/go,ssrl/go,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,gnanderson/go,apparentlymart/golang,gnanderson/go,apparentlymart/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,apparentlymart/golang,dsriram/golang,gnanderson/go