make jpkg resource path absolute

[Dalibor Topic]

Akhil Arora wrote:
> An absolute path passed to -r is not accepted at all - jpkg insists on
> being given a relative path for -r.

Fixed by
http://hg.openjdk.java.net/jigsaw/jigsaw/jdk/rev/48c8ace4e18d

cheers,
dalibor topic
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