Update glibc revision to 168f54c
Update glibc revision to 168f54c

168f54c Remove nonzero %gs access from bits/atomic.h
3e75d2e Fix dynamic library linking.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2176
TEST= toolchain trybot

R=khim@google.com,eaeltsin@google.com,pasko@google.com,mseaborn@chromium.org

Review URL: http://codereview.chromium.org/7715038

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6523 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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