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r499086 switched the Linux packaging staging dirs from /tmp to the out
directory.  This means it's no longer necessary to serialize package
builds.

The original CL passed argv[2:] to bash instead of argv[1:].

BUG=758654
R=thestig@chromium.org
TBR=rdevlin.cronin@chromium.org

Change-Id: If6dc9c35edeb60337b944a2a4350875274241747
Reviewed-on: https://chromium-review.googlesource.com/661780Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501111}