Add target_ops argument to to_supports_non_stop

Add target_ops argument to to_supports_non_stop

2014-02-19  Tom Tromey  <tromey@redhat.com>

	* target.h (struct target_ops) <to_supports_non_stop>: Add
	argument.
	* target.c (find_default_supports_non_stop): Add argument.
	(target_supports_non_stop): Add argument.
	(find_default_supports_non_stop): Add 'self' argument.
	* remote.c (remote_supports_non_stop): Add 'self' argument.
	* linux-nat.c (linux_nat_supports_non_stop): Add 'self' argument.