[PATCH v3 24/37] nptl: Move pthread_key_create, __pthread_key_create into libc

[Florian Weimer]

* Adhemerval Zanella:

> Sigh... the description at libgcc/gthr-posix.h is *really* hacky and I
> think we provide the __libc_single_threaded exactly to avoid keep
> providing this kind of interfaces.

The newer versions should use it, but there is just one header file
shared by everything POSIX-like.

>> Right that, applies in other places throughout the series, too.
>> 
>> Speaking of which, should I repost the compat_symbol patches?
>
> Isn't the one in patchwork the latest [1]?
>
> [1] https://patchwork.sourceware.org/project/glibc/patch/07c2defd7f03c5f2493a4132de673f33457d7806.1616184336.git.fweimer@redhat.com/

I think it lacks the __attribute__ ((nocommon)) for
__malloc_initialize_hook (need for building with GCC 9 and earlier).

Thanks,
Florian