hg: build-infra/jdk8: Fixed help message when build-aux files are missing.

[erik.joelsson at oracle.com]

Changeset: 5a153b13490b
Author:    erikj
Date:      2011-12-14 09:57 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/5a153b13490b

Fixed help message when build-aux files are missing.

! common/autoconf/configure
! common/autoconf/configure.ac