* libmisc/non_interactive_pam_conv.c,

	* libmisc/non_interactive_pam_conv.c,
	libmisc/pam_pass_non_interractive.c, libmisc/Makefile.am: Renamed.
	* libmisc/pam_pass_non_interractive.c, lib/prototypes.h:
	non_interactive_password and non_interactive_pam_conv do not need
	to be externally visible.
	* libmisc/pam_pass_non_interractive.c: Added declaration of
	ni_conv.
	* libmisc/pam_pass_non_interractive.c: Only compile ifdef USE_PAM.
	* libmisc/pam_pass_non_interractive.c, lib/prototypes.h:
	Added do_pam_passwd_non_interractive().
	* src/chpasswd.c: Use do_pam_passwd_non_interractive().