tuple (__conv_types, [...]): Remove.

2011-11-21  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/tuple (__conv_types, __one_by_one_convertible,
	__all_convertible): Remove.
	(tuple<>::tuple(_UElements&&...),
	tuple<>::tuple(const tuple<_UElements...>&),
	tuple<>::tuple(tuple<_UElements...>&&)): Remove wa for c++/48322.

From-SVN: r181555