JDK10 build on Win64 fails on `make images`

[Oleksandr Nikitin]

TLDR: configure seems to run fine, but the `make images` step fails with
the error: No rule to make target `java.base-libs`

I am following this guide: http://openjdk.java.net/jeps/8174901

Full build log:
https://gist.github.com/wizzard0/ad8406ea1c2aea4bfe9faeda35a76dd0

JDK9 builds fine in this environment (so I assume it is configured mostly
correctly).

I can provide access to the machine if needed.

Thanks in advance!

-- 
With best wishes, Oleksandr Nikitin

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