[Bug libstdc++/51749] Including <algorithm> pollutes global namespace

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51749

--- Comment #22 from Paolo Carlini <paolo.carlini at oracle dot com> ---
If I remember correctly, the gthr.h included by ext/atomicity.h is also a big
issue. If we switch to a non-reference-counted basic_string we can make
progress but another usage is in <locale>, global locale & co.