[PATCH] Use TLS initial-exec model for __libc_tsd_* thread variables

[Florian Weimer]

* Jens Remus:

>>> Eventually, we should use local-exec TLS for libc.a, addressing (1).
>>> I hope it won't bring back the S390 bug.
>
> Given the GNU linker fix in Binutils 2.41 this should not be an issue.

Our minimum required version currently is 2.39.

We need to backport the <ctype.h> fix to older branches, so bumping the
binutils requirement is not really an option.

The commit message should reference __libc_tsd_CTYPE_*.  There's another
historic leftover, __libc_tsd_LOCALE, which is not updated by this
patch.

With that change:

Reviewed-by: Florian Weimer <fweimer@redhat.com>

(And please drop the Signed-off-by:, too, per Stefan's latest comments.)

Thanks,
Florian