stdlib: Testcase to show wrong atexit execution order

This testcase is based on the one discussed on libc-help [1]

[1] https://github.com/mulle-nat/ld-so-breakage

The atexit calls are done by the DSO constructors and program expects
the handlers to be executed in the reverse order the library are
loaded.

The issue is _dl_fini might re-sort the order when libraries are
unloaded and the __cxa_finalize (called by __do_global_dtors_aux
set in arrayfini from DSO) might in turn call its registered atexit
in a wrong order.

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