am 0178eba2: am 9700b6ca: am 22ade3c3: Merge "With libstdc++ in libc, __futex_wait and __futex_wake can be hidden."

* commit '0178eba213dfec500e71cd9889ece5af2f7de4cb':
  With libstdc++ in libc, __futex_wait and __futex_wake can be hidden.