pathname (ABS_DIST) under MSYS on Windows. We use the same method to to define MOZ_BUILD_ROOT in configure.in. The patch is contributed by Chris Seawood <cls@seawood.org>. r=wtc. git-svn-id: svn://10.0.0.236/trunk@187773 18797224-902f-48f8-a5cc-f745e15eee43