hg: build-infra/jdk8: Remove bash-isms in configure.

[magnus.ihse.bursie at oracle.com]

Changeset: 2f1edf0672c9
Author:    ihse
Date:      2012-06-07 11:26 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/2f1edf0672c9

Remove bash-isms in configure.

! common/autoconf/configure.ac
! common/autoconf/generated-configure.sh
! common/autoconf/help.m4