system_error (system_error::system_error(error_code), [...]): Fix for what() to return the NBTS recommended in the Note in 19.5.6.2/14.

2010-09-16  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/system_error (system_error::system_error(error_code),
	system_error(error_code, const string&), system_error(int, const
	error_category&), system_error(int, const error_category&,
	const string&)): Fix for what() to return the NBTS recommended in
	the Note in 19.5.6.2/14.
	* testsuite/19_diagnostics/system_error/cons-1.cc: Adjust.
	* testsuite/19_diagnostics/system_error/what-1.cc: Likewise.
	* testsuite/19_diagnostics/system_error/what-2.cc: Likewise.
	* testsuite/19_diagnostics/system_error/what-big.cc: Likewise.
	* testsuite/19_diagnostics/system_error/what-3.cc: Likewise.

	* testsuite/19_diagnostics/system_error/what-4.cc: Tidy includes.

From-SVN: r164339