Add missing _Safe_local_iterator_base::_M_attach_symbol export

[François Dumont]

As reported in another mail a symbol is missing.

This patch update test framework so that the problem is obvious and fix it.

 Â Â Â  * testsuite/util/testsuite_containers.h
 Â Â Â  (forward_members_unordered<>::forward_members_unordered
 Â Â Â  (const value_type&)): Add local_iterator pre and post increment checks.
 Â Â Â  * config/abi/pre/gnu.ver: Add GLIBCXX_3.4.26 new symbol.

Tested under Linux x86_64.

Ok to commit ?

François

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