Fix cmake build
Fix cmake build

The cmake build was slightly broken after the LLVM 3.5 merge. Fix it.

R= dscuff@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3930
TEST= ./toolchain_build/toolchain_build_pnacl.py --verbose --cmake

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@14138 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client