refactor: set local _ARGCHECK instead of dereferencing debug_init.

* lib/std/array.lua, lib/std/base.lua, lib/std/function.lua,
lib/std/io.lua, lib/std/list.lua, lib/std/package.lua,
lib/std/string.lua, lib/std/table.lua: Set local _ARGCHECK
instead of importing std.debug_init and dereferencing it all the
time.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>