Switching win8 bots to build newlib instead of glibc.
Switching win8 bots to build newlib instead of glibc.

As we have more tests that run with newlib, its better to have win8 run these.

BUG=None
TEST=None
R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/12093048

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10679 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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