Turn on -strip-metadata in pnacl-finalize.
Turn on -strip-metadata in pnacl-finalize.

Generated Spec2k nexes are exactly identical on x86-64, with and
without the metadata.  Pexes are smaller.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3348

Review URL: https://codereview.chromium.org/13685023

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11146 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client