Delete some unused files the tests directory.

tests/Makefile.tests:
	Delete an old Makefile that was resurrected during the
	conversion from SVN.

tests/debugger/interactive.exp2:
	Delete a file that is not being used.
Fix failing decldebug tests.

tests/debugger/declarative/builtin_call_rep.exp:
	The current definition of the proc_defn_rep structure has
	an additional field.

tests/debugger/declarative/condition_bug.m:
	Replace the use of the now-deleted svmap module.

tests/debugger/declarative/condition_bug.exp:
	Update this to conform to the current definition of the
	I/O state in C grades.