[v3] unify 3_4 and 3_5 libstdc++

[Paolo Carlini]

Paolo Carlini wrote:

> FAIL: 22_locale/num_put/put/char/wrapped_env.cc execution test
> FAIL: 22_locale/num_put/put/char/wrapped_locale.cc execution test
> FAIL: 22_locale/num_put/put/wchar_t/4.cc execution test
> FAIL: 22_locale/num_put/put/wchar_t/wrapped_env.cc execution test
> FAIL: 22_locale/num_put/put/wchar_t/wrapped_locale.cc execution test

Turned out to be simply a buffer overflow: for printing a showbase-d 64-bit
pointer we need 18 positions. For some reason, the new-based allocator is
more sensitive to that.

Benjamin, please apply the below when appropriate.

Paolo.

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