RFR: 6173: jmc -open requires full path

[Marcus Hirt]

On Wed, 7 Oct 2020 19:09:52 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

> Handle special Mac case where user.dir is set by mac eclipse launcher
> to the directory where is jmc binary.
> Hopfully, PWD env var is kept where the program was launched so we can use it
> to prepend to the providing filename.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/123