The clang compiler now supports variadic macros by default.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86780 b8fc166d-592f-0410-95f2-cb63ce0dd405
Initial merge of cpp_bin_float code from sandbox.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86781 b8fc166d-592f-0410-95f2-cb63ce0dd405