* lib/shadowmem.c: Added spw_free().

	* lib/shadowmem.c: Added spw_free().
	* lib/shadowio.c: Use spw_free() for shadow_free().
	* lib/groupmem.c: Added gr_free().
	* lib/groupio.c: Use gr_free() for group_free().
	* lib/pwmem.c: Include define.h before prototypes.h
	* lib/pwmem.c: Added pw_free().
	* lib/pwio.c: Use pw_free() for passwd_free().
	* lib/sgroupio.c: Added sgr_free().
	* lib/sgroupio.c: Use sgr_free() for gshadow_free().
	* lib/prototypes.h: Added gr_free(), pw_free(), sgr_free(),
	spw_free().