hg: jdk8u/jdk8u-dev: 8034199: Add 'reconfigure' target for re-creating a configuration

[kevin.walls at oracle.com]

Changeset: 2209644bcac4
Author:    kevinw
Date:      2018-04-10 07:46 -0700
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/rev/2209644bcac4

8034199: Add 'reconfigure' target for re-creating a configuration
Reviewed-by: ihse, erikj, tbell

! common/autoconf/basics.m4
! common/autoconf/configure
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! make/Main.gmk