* lib/defines.h: Include <config.h> since it uses the macro that

	* lib/defines.h: Include <config.h> since it uses the macro that
	might be defined in this header file.
	* lib/defines.h: Prefer checking if HAVE_LOCALE_H or ENABLE_NLS
	are defined (rather than set to non 0).
	* lib/defines.h: The dummy implementations of bindtextdomain() and
	textdomain() should return a pointer. Return NULL instead of
	/* empty */
	* lib/defines.h: Define SHADOW_SP_FLAG_UNSET, to be used for the
	initialization of sp_flag field of the shadow structures.
	* lib/defines.h: Define LC_ALL, needed even if HAVE_LOCALE_H is
	not defined.