jlink with an existing output directory

[Fabian Meumertzheim]

Hi,

I noticed that jlink fails if the directory specified with --output already
exists. This makes it less convenient to use the tool with build systems
that pre-create output directories and expect build actions to fill them
(e.g. Bazel).

Would you accept a change that loosens the check to allow for the directory
to exist as long as it is empty?

Fabian
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