RFR: 8326368: compare.sh -2bins prints ugly errors on Windows

[Erik Joelsson]

On Tue, 20 Feb 2024 20:01:40 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The logic in the compare script assumes that we compare two directories, and so always have an `$OTHER`. If we are using `-2dirs`, this is not the case, causing `cygpath` and the following `ls` to fail and print error messages about missing paths. These are benign but annoying.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17936#pullrequestreview-1891578612