constify to_load

constify to_load

This makes the argument to the target_ops to_load method "const", and
fixes up the fallout.  Tested by rebuilding all the affected files.

2014-06-26  Tom Tromey  <tromey@redhat.com>

	* defs.h (generic_load): Update.
	* m32r-rom.c (m32r_load_gen): Make "filename" const.
	* monitor.c (monitor_load): Make "args" const.
	* remote-m32r-sdi.c (m32r_load): Make "args" const.
	* remote-mips.c (mips_load_srec, pmon_load_fast): Make "args"
	const.
	(mips_load): Make "file" const.
	* remote-sim.c (gdbsim_load): Make "args" const.
	* remote.c (remote_load): Make "name" const.
	* symfile.c (generic_load): Make "args" const.
	* target-delegates.c: Rebuild.
	* target.c (target_load): Make "arg" const.
	(debug_to_load): Make "args" const.
	* target.h (struct target_ops) <to_load>: Make parameter const.
	(target_load): Update.