hg: build-infra/jdk8/hotspot: On msys, nmake needs windows-paths (c:\...), not mixed-paths (c:/...). Msys

[magnus.ihse.bursie at oracle.com]

Changeset: f85624ba03e2
Author:    ihse
Date:      2012-09-27 11:13 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/hotspot/rev/f85624ba03e2

On msys, nmake needs windows-paths (c:\...), not mixed-paths (c:/...). Msys
seems a bit erratic if it auto-converts to windows or mixed paths.

! make/windows/makefiles/defs.make