Fix location of gcc toolchain tarballs.
Fix location of gcc toolchain tarballs.

This is starting to show up as a failure on the NaCl
SDK bots, but I guess it went unnoticed during in the
try runs since the old tarball still existing in
the .tars folder.

This change is enough to fix the linux (and chromeos)
bots.  Mac and windows fix in a followup CL due to
chromeos urgency.

R=mcgrathr@chromium.org

Review URL: https://codereview.chromium.org/104873008

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12556 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client