circular_buffer: fixed when BOOST_NO_STDC_NAMESPACE defined

svn path=/trunk/boost/circular_buffer/; revision=66690
circular_buffer: fixed (the fix ;-) when BOOST_NO_STDC_NAMESPACE defined

svn path=/trunk/boost/circular_buffer/; revision=66691
eliminated unit_test_framework

svn path=/trunk/libs/circular_buffer/; revision=74733