[PATCH][_GLIBCXX_INLINE_VERSION] Fix <contracts>

[François Dumont]

libstdc++: Remove std::constract_violation from versioned namespace

GCC expects this type to be in std namespace directly.

libstdc++-v3/ChangeLog:

     * include/experimental/contract:
     Remove _GLIBCXX_BEGIN_NAMESPACE_VERSION/_GLIBCXX_END_NAMESPACE_VERSION.

It does fix 29 g++.dg/contracts in gcc testsuite.

Ok to commit ?

François
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