Fix notices

include/ac/alloca.h

include/ac/assert.h

include/ac/bytes.h

include/ac/crypt.h

include/ac/ctype.h

include/ac/dirent.h

include/ac/errno.h

include/ac/krb.h

include/ac/krb5.h

include/ac/localize.h

include/ac/param.h

include/ac/regex.h

include/ac/setproctitle.h

include/ac/signal.h

include/ac/socket.h

include/ac/stdarg.h

include/ac/stdlib.h

include/ac/string.h

include/ac/sysexits.h

include/ac/syslog.h