stl_algo.h (minmax(initializer_list<>): Use make_pair, consistently with the other overload for initializer_list.

2008-09-21  Paolo Carlini  <paolo.carlini@oracle.com>

 	* include/bits/stl_algo.h (minmax(initializer_list<>): Use make_pair,
	consistently with the other overload for initializer_list.

From-SVN: r140524