elf: Run tst-audit-tlsdesc, tst-audit-tlsdesc-dlopen everywhere

The test is valid for all TLS models, but we want to make a reasonable
effort to test the GNU2 model specifically.  For example, aarch64
defaults to GNU2, but does not have -mtls-dialect=gnu2, and the test
was not run there.

Suggested-by: Martin Coufal <mcoufal@redhat.com>
(cherry picked from commit dd2315a8)

Fixes early backport commit 577c2fc7
("elf: Call __libc_early_init for reused namespaces (bug 29528)");
it had a wrong conflict resolution.