libstdc++-v3-dg.exp (libstdc++-v3-init, [...]): Additionally handle files one level deeper in glob patterns.

	* testsuite/lib/libstdc++-v3-dg.exp (libstdc++-v3-init,
	libstdc++-v3-list-sourcefiles): Additionally handle files one
	level deeper in glob patterns.

	* testsuite/27_io/istream_extractor_arith.cc: Delete, split...
	* testsuite/27_io/istream_extractor_arith/01.cc,
	testsuite/27_io/istream_extractor_arith/02.cc,
	testsuite/27_io/istream_extractor_arith/03.cc,
	testsuite/27_io/istream_extractor_arith/06.cc,
	testsuite/27_io/istream_extractor_arith/07.cc,
	testsuite/27_io/istream_extractor_arith/08.cc,
	testsuite/27_io/istream_extractor_arith/09.cc,
	testsuite/27_io/istream_extractor_arith/10.cc,
	testsuite/27_io/istream_extractor_arith/11.cc,
	testsuite/27_io/istream_extractor_arith/12.cc,
	testsuite/27_io/istream_extractor_arith/13.cc: ... to new files.
	* testsuite/27_io/istream_extractor_arith/12.cc: Add XFAIL for
	sparc*-*-solaris2*.

From-SVN: r60934