* Makefile.am (DEJATOOL): List tools in testsuite.

	* Makefile.am (DEJATOOL): List tools in testsuite.
	(RUNTESTDEFAULTFLAGS): Adjust to support per-tool testing.
	* testsuite/config/default.exp: Rename from this ...
	* testsuite/lib/runtest.exp: ... to this.
	(runtest_exit): Remove spurious "close". This was causing per-tool
	testing to fail, since the testsuite for "runtest" never actually
	uses "spawn", so "close" ends up closing exp0, which is the
	terminal.  The ${tool}_exit proc is not called if the --tool
	option is not given, so this had no effect earlier.
	* testsuite/lib/libdejagnu.exp: New empty file.

Signed-off-by: Ben Elliston <bje@gnu.org>