Use version namespace in normal mode

[François Dumont]

Hi

     I think _GLIBCXX_BEGIN_NAMESPACE_ALGO should default to 
_GLIBCXX_BEGIN_NAMESPACE_VERSION when parallel mode is not active. Same 
for _GLIBCXX_BEGIN_NAMESPACE_CONTAINER, no ?

     * include/bits/c++config (_GLIBCXX_BEGIN_NAMESPACE_ALGO)
     (_GLIBCXX_END_NAMESPACE_ALGO): Default to respectively
     _GLIBCXX_BEGIN_NAMESPACE_VERSION and _GLIBCXX_END_NAMESPACE_VERSION
     when parallel mode is not active.
     (_GLIBCXX_BEGIN_NAMESPACE_CONTAINER, _GLIBCXX_END_NAMESPACE_CONTAINER):
     Likewise.

     Ok to commit after normal check ? Should I rebuild library with 
versioned namespace activated ?

François

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