Add nacl_helper_bootstrap to the SDK
Add nacl_helper_bootstrap to the SDK

In order to launch the standalone sel_ldr, we need to add the nacl_helper
to the SDK for Linux.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2401
TBR=bradnelson@google.com 
Review URL: https://chromiumcodereview.appspot.com/9733016

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@8065 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client