hg: jdk9/dev: 8031759: Improved tool overriding in configure

[magnus.ihse.bursie at oracle.com]

Changeset: 82b65f34b79d
Author:    ihse
Date:      2014-01-29 11:21 +0100
URL:       http://hg.openjdk.java.net/jdk9/dev/rev/82b65f34b79d

8031759: Improved tool overriding in configure
Reviewed-by: tbell, mduigou, erikj

! common/autoconf/basics.m4
! common/autoconf/configure
! common/autoconf/generated-configure.sh
! common/autoconf/toolchain.m4