hg: build-infra/jdk8: Continue splitting configure.ac; now introducing basics.m4, and also moving

[magnus.ihse.bursie at oracle.com]

Changeset: 18bcbf8011c7
Author:    ihse
Date:      2012-06-11 19:26 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/18bcbf8011c7

Continue splitting configure.ac; now introducing basics.m4, and also moving
some parts to other .m4 files.

! common/autoconf/basics.m4 < common/autoconf/configure.ac
+ common/autoconf/configure.ac
! common/autoconf/generated-configure.sh
! common/autoconf/help.m4
! common/autoconf/jdk-options.m4
! common/autoconf/toolchain.m4