string: Use tls-internal on strerror_l
The buffer allocation uses the same strategy of strsignal. Checked on x86-64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu, and s390x-linux-gnu. Tested-by:Carlos O'Donell <carlos@redhat.com> Reviewed-by:
Carlos O'Donell <carlos@redhat.com>
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