hg: build-infra/jdk8: Fix partial: JDK-8001594 Enable closed builds on Windows with Cygwin and MinGW/MSYS

[tim.bell at oracle.com]

Changeset: 8a0f08ebc77f
Author:    tbell
Date:      2012-12-22 13:09 -0800
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/8a0f08ebc77f

Fix partial: JDK-8001594 Enable closed builds on Windows with Cygwin and MinGW/MSYS
Cygwin related changes.  Additional MSYS work TBD.

! common/autoconf/generated-configure.sh