Fix gdbserver to build OK with 4.8 tool chain.

2013-02-19  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* configure.srv (arc*-*-linux*): Add linux-osdata.o,
	linux-procfs.o and linux-ptrace.o to srv_tgt_obj.
	(arc*-*): Deleted.
	* linux-arc-low.c (init_registers_arc): Provide prototype.
	(arc_arch_setup): Created.
	(arc_get_pc): add regcache first argument, use in call to
	collect_register_by_name.
	(arc_set_pc): add regcache first argument, use in call to
	supply_register_by_name.
	(arc_reinsert_addr): allocate regcache and pass to
	collect_register_by_name.
	(the_low_target): Add arc_arch_setup, insert NULLs for new shape
	of structure.