To allow toolchain script to run successfully on x86 hosts.

R=phajdan.jr@chromium.org
TBR=iannucci@chromium.org
BUG=349824

Review URL: https://codereview.chromium.org/189563003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@255641 0039d316-1c4b-4281-b951-d872f2087c98