The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
Stop using the public global name of dl_iterate_phdr in tls/tls.c:
__libc_static_tls_setup().
Follow the approach with other dlopen(3)-like functions with the
namespace.h in the dl_iterate_phdr() case. Use internally a weak symbol:
__dl_iterate_phdr instead of dl_iterate_phdr.
Sponsored by <The NetBSD Foundation>
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