* include/bits/basic_string.h (getline): Qualify call to prevent ADL
	and add overloads for rvalue streams.
	* testsuite/21_strings/basic_string/inserters_extractors/char/12.cc:
	New.
	* testsuite/21_strings/basic_string/inserters_extractors/wchar_t/12.cc:
	New.

From-SVN: r213869