Fix libstdc++/24196 for ext/vstring/rc by returning to the behavior of basic_string pre-2003-06-13...

2005-10-07  Paolo Carlini  <pcarlini@suse.de>

	Fix libstdc++/24196 for ext/vstring/rc by returning to the behavior
	of basic_string pre-2003-06-13; remove fully-dynamic-string stuff.
	* include/ext/rc_string_base.h (_M_refcopy): Move inside the
	_Rep class and remove code in macro.
	(__rc_string_base()): Construct with _S_empty_rep()._M_refcopy().
	(_M_dispose, _M_leak_hard): Remove code in macro.
	(_S_construct): Return _S_empty_rep()._M_refcopy() for empty string.
	(_M_grab): Adjust.

	* include/ext/rc_string_base.h (_Rep::_M_refdata()): Minor tweak,
	mark throw().

From-SVN: r105090