Convert rs->support_vCont_t to a struct.

Convert rs->support_vCont_t to a struct.

Convert the 'support_vCont_t' int field to a struct, in preparation
for adding more fields to it.

gdb/
2013-05-23  Yao Qi  <yao@codesourcery.com>
	    Pedro Alves  <palves@redhat.com>

	* remote.c (struct vCont_action_support): New struct.
	(struct remote_state) <support_vCont_t>: Remove field.
	<vCont_actions_support>: New field.
	(remote_vcont_probe, remote_stop_ns): Update.