[v3] libstdc++/28514

[Benjamin Kosnik <bkoz at redhat dot com>]

This reverts the change that introduced anonymous namespace usage in
some libstdc++ include files.

I was previously under the (mistaken) impression that these namespaces
represented attempts at internal linkage. Thus, the conversion to
anonymous namespaces, which do in fact have internal linkage. However,
as Jason righly points out, this leads to bloated executables that try
to use TR1 facilities for random and unordered_* containers. So, I have
revert the anonymous namespace bits for these files and plan on
re-evaluting the TR1 linkage situation at a later date.

tested x86/linux

-benjamin

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