hg: build-infra/jdk8: Initial support for MSYS (MinGW).

[magnus.ihse.bursie at oracle.com]

Changeset: 49cbdd92e2a1
Author:    ihse
Date:      2012-09-20 16:43 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/49cbdd92e2a1

Initial support for MSYS (MinGW).

! common/autoconf/basics.m4
! common/autoconf/boot-jdk.m4
! common/autoconf/build-aux/config.guess
! common/autoconf/platform.m4
! common/autoconf/spec.gmk.in
! common/autoconf/toolchain.m4