hg: jdk8/build: 7152336: Enable builds on Windows with MinGW/MSYS

[tim.bell at gmail.com]

Changeset: c12e759ac4e8
Author:    tbell
Date:      2012-10-23 10:10 -0700
URL:       http://hg.openjdk.java.net/jdk8/build/rev/c12e759ac4e8

7152336: Enable builds on Windows with MinGW/MSYS
Summary: Minimal makefile changes to enable building OpenJDK using MSYS on Windows7
Reviewed-by: ohair, tbell
Contributed-by: volker.simonis at gmail.com

! README-builds.html
+ make/scripts/fixpath.pl
! make/scripts/vsvars.sh