Make the go32-nat.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.

Tested by cross building on Fedora 17.

gdb/
2014-03-07  Pedro Alves  <palves@redhat.com>

	* go32-nat.c: Include inf-child.h.
	(go32_ops): Delete global.
	(go32_close, go32_detach, go32_prepare_to_store, go32_can_run):
	Delete methods.
	(go32_create_inferior): Push the passed in target pointer instead
	of referencing go32_ops.
	(init_go32_ops): Delete function.  Moved parts to _initialize_go32_nat.
	(go32_target): New function, based on init_go32_ops, but inherit
	inf_child_target.
	(_initialize_go32_nat): Use go32_target.  Move parts of
	init_go32_ops here.