* lib/Makefile.am: Add entry for yesno.c.
	* lib/Makefile.in: Likewise.
	*src/Makefile.am: Add backup-files entry.
	Use AM_CFLAGS insted of AM_CPPFLAGS.
	* src/clean-user-config.c (main): Adjust function call in switch
	case for GETOPT_HELP_CHAR and GETOPT_VERSION_CHAR and default.