Simplify pnacl's usage in spec makefile to do away with multiple link steps.
Simplify pnacl's usage in spec makefile to do away with multiple link steps.

Also, make the unoptimized case skip LTO, etc. So that we can
measure the difference.
Review URL: http://codereview.chromium.org/7022001

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5359 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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