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Make nacl_helper_bootstrap load a PIE normally, not the dynamic linker directly

This makes it more like the way a PIE is normally run when loaded by
the kernel.  It doesn't rely on the dynamic linker's feature of being
run from the command line.  It also avoids hard-coding the canonical
machine-dependent file name of the dynamic linker.  Instead, it just
obeys PT_INTERP the same way the kernel would.

BUG= none
TEST= nacl still works

R=mseaborn@chromium.org,bradchen@google.com

Review URL: http://codereview.chromium.org/8524015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109734 0039d316-1c4b-4281-b951-d872f2087c98