[PATCH 1/3] nptl: Move nanosleep implementation to libc

[Florian Weimer]

* Adhemerval Zanella:

> diff --git a/nptl/Versions b/nptl/Versions
> index adbd4fa589..92291bf49e 100644
> --- a/nptl/Versions
> +++ b/nptl/Versions

> -  GLIBC_2.2.6 {
> -    # Cancellation wrapper
> -    __nanosleep;
> -  }

Sorry, this change is not correct because it removes the GLIBC_2.2.6
symbol version.  Old programs will fail to load as a result, not due to
the missing __nanosleep@@GLIBC_2.2.6 (we removed that check, and the
symbol in libc is sufficient), but due to the overall GLIBC_2.2.6 check
for libpthread.  You can use __libpthread_version_placeholder as a stub
symbol to keep that version alive.

Thanks,
Florian