hg: build-infra/jdk8: * Update and improve configure --help messages.

[magnus.ihse.bursie at oracle.com]

Changeset: 521b6460016d
Author:    ihse
Date:      2012-04-04 14:12 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/521b6460016d

* Update and improve configure --help messages.
* Fix some messages in configure.
* Rename "head" to "headful"; also including --disable-head to --disable-headful.
* Rename strangely named --with-[cups|alsa|pulse]_[lib|include] to use a "-" instead of "_".

! common/autoconf/configure
! common/autoconf/configure.ac
! common/autoconf/platform.m4
! common/autoconf/spec.gmk.in