* gdb.t07/watchpoint.exp (test_simple_watchpoint): Set up

	* gdb.t07/watchpoint.exp (test_simple_watchpoint):  Set up
	expected fail for i486-*-* that misses the marker2 function.
	* gdb.t10/crossload.exp (bfddefault):  Allow successful
	recognition of a format to pass even if no symbols are found.
	Explicitly catch failures where the format is not recognized
	or is ambiguous, and add the reason to the fail message.
	* gdb.t10/crossload.exp (bfdexplicit):  Catch failure where
	the cause is and invalid target and add reason to failure message.
	* gdb.t10/crossload.exp:  Fix bfd target names for elf32-m68k,
	elf32-i386, elf32-sparc, and elf32-i860.
	* gdb.t12/scope.exp (test_at_main, test_at_foo, test_at_bar):
	Set up expected failure for 'filename'::variable scope resolution,
	which is now apparently broken on all targets.
	* gdb.t20/classes.exp, gdb.t20/inherit.exp, gdb.t20/misc.exp,
	gdb.t21/cplusfuncs.exp, gdb.t22/virtfunc.exp,
	gdb.t23/templates.exp:   Change failure for missing binfile into
	just a warning.
	gdb.t21/demangle.exp:  Change all cfront references to 'arm'
	references.