Race condition between hotspot build/import

[David Holmes]

I'm currently always getting a build failure on a clean build when 
cross-compiling (which I don't think affects anything other than timing).

The problem seems to be that the top-level make kicks of the hotspot and 
jdk makes concurrently, and the first part of the JDK make tries to 
import hotspot, and the hotspot/dist directory doesn't exist yet.

I found the following changeset:

# HG changeset patch
# User ihse
# Date 1347352614 -7200
# Node ID 0d8ad4b406dff44492a906462af42be185aa7d3b
# Parent  61eb8ec239f7547b78fd600b6359b2de2389dcec
Protect the top-level Makefile against race conditions happening if
inadvertently running with -jN.

But the problem still exists.

David
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