* testsuite/libdejagnu: New directory for dejagnu library test

	* testsuite/libdejagnu: New directory for dejagnu library test
	cases.
	* testsuite/libdejagnu/unit.cc: Test case for dejagnu.h.
	* testsuite/libdejagnu/tunit.exp: Test driver for dejagnu.h.
	* testsuite/libdejagnu/Makefile.am: New makefile to build the test
	case.
	* testsuite/libdejagnu/Makefile.in: Generated.
	* testsuite/Makefile.am: Add libdejagnu to SUBDIRS. Replace the
	site.exp rule, cause we don't want the $tool setting, so we run
	all the test suites. Don't pass the tool name for "make check".
	* configure.in: Add testsuite/libdejagnu/Makefile to AC_OUTPUT.