Add missing symbols for versioned namespace

[François Dumont]

Hi

     I might not be the right one to propose this patch as I am not sure 
that I fully understand gnu-versioned-namespace.ver organization. But 
with it following test failures when using versioned namespace vanish:

FAIL: 20_util/allocator/overaligned.cc (test for excess errors)
FAIL: ext/bitmap_allocator/overaligned.cc (test for excess errors)
FAIL: ext/mt_allocator/overaligned.cc (test for excess errors)
FAIL: ext/new_allocator/overaligned.cc (test for excess errors)
FAIL: ext/pool_allocator/overaligned.cc (test for excess errors)

     Ok to commit ?

     * config/abi/pre/gnu-versioned-namespace.ver: Export C++17 new of
     over-aligned types symbols.

François

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