hg: build-infra/jdk8: * Print additional help for OpenJDK-specific configure options.

[magnus.ihse.bursie at oracle.com]

Changeset: 88ee009a0218
Author:    ihse
Date:      2012-10-24 22:17 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/88ee009a0218

* Print additional help for OpenJDK-specific configure options.
* Improve robustness in configure wrapper.
* Print autoconf exit code if non-zero.

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