Fix the linux_nacl_sdk
Fix the linux_nacl_sdk

PNaCl does not include objdump currently thus build of
pnacl_irt_shim for arm fails with
  pnacl-objcopy: not found
message.

Sadly this does not happen on NaCl waterfall, it only happens
on linux_nacl_sdk bot.

R=bradnelson@google.com

Review URL: https://codereview.chromium.org/14907010

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11296 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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