hg: jdk8u/jdk8u-dev: 8196108: Add build support for VS 2015/2017

[kevin.walls at oracle.com]

Changeset: 1a5c98aae346
Author:    kevinw
Date:      2018-06-08 14:06 -0700
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/rev/1a5c98aae346

8196108: Add build support for VS 2015/2017
Reviewed-by: ihse, tbell

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh
! common/autoconf/help.m4
! common/autoconf/toolchain_windows.m4