char_traits.h (char_traits<char16_t>:: assign(char_type*, size_t, char_type), [...]): For now, just open-code.

2008-08-20  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/char_traits.h (char_traits<char16_t>::
	assign(char_type*, size_t, char_type), char_traits<char32_t>::
	assign(char_type*, size_t, char_type)): For now, just open-code.

From-SVN: r139367