hash.cc (hash<string>::operator()(string), hash<wstring>::operator()(wstring)): Do not decorate as throwing nothing.

2009-08-07  Paolo Carlini  <paolo.carlini@oracle.com>

	* src/hash.cc (hash<string>::operator()(string),
	hash<wstring>::operator()(wstring)): Do not decorate as throwing
	nothing.
	* include/bits/functional_hash.h (hash<error_code>::
	operator()(error_code)): Likewise.

From-SVN: r150566