Fix a bug that, oddly enough, has been around for quite a while. Turns out  that TargetMachine is only important for executable targets, and I only recently added a 64-bit target that's not a static library.
Fix a bug that, oddly enough, has been around for quite a while. Turns out 
that TargetMachine is only important for executable targets, and I only recently
added a 64-bit target that's not a static library.

Review URL: http://codereview.chromium.org/537008

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@1304 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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