* gdb.base/overlays.exp: Preliminary fixes; temporarily disabled

	* gdb.base/overlays.exp: Preliminary fixes; temporarily disabled
 	until it has been modified to work with the new testsuite.

	* gdb.*/*.exp: Instead of causing 1 unresolved test when the
 	testcase won't compile, cause all of the testcases in the file to
 	fail instead.

	* lib/gdb.exp(gdb_suppress_entire_file): New procedure.
	(gdb_clear_suppressed): New procedure.
	(gdb_stop_suppressing_tests): Only clear suppress_flag if
	it contains a positive value.