hg: build-infra/jdk8: Make more robust detection if open and closed configure gets out of sync.

[magnus.ihse.bursie at oracle.com]

Changeset: 84eb1bc4b1b5
Author:    ihse
Date:      2012-06-13 14:01 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/84eb1bc4b1b5

Make more robust detection if open and closed configure gets out of sync.

! common/autoconf/autogen.sh
! common/autoconf/configure
! common/autoconf/configure.ac
! common/autoconf/generated-configure.sh