Make the nto-procfs.c target inherit inf-child.c.

Make the nto-procfs.c target inherit inf-child.c.

So that all native targets inherit a single "superclass".

Target methods that are set to or do the same as inf-child.c's are
removed.

Not tested.

gdb/
2014-03-12  Pedro Alves  <palves@redhat.com>

	* nto-procfs.c: Include inf-child.h.
	(procfs_ops): Delete global.
	(procfs_can_run): Delete method.
	(procfs_detach, procfs_mourn_inferior): Unpush the passed in
	target pointer instead of referencing procfs_ops.
	(procfs_prepare_to_store): Delete.
	(init_procfs_ops): Delete function.
	(procfs_target): New function, based on init_procfs_ops, but
	inherit inf_child_target.
	(_initialize_procfs): Use procfs_target.