RFR: 8347570: Configure fails on macOS if directory name do not have correct case [v2]

[Erik Joelsson]

On Fri, 9 May 2025 17:45:36 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> If you have a directory `OpenJDK` and do `cd openjdk`, this will register the current directory as `openjdk`, not `OpenJDK`. This will later on make the check in configure to see if we are in the root directory (to determine where to put the configuration) will fail, since it does a case-sensitive comparison.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use tr instead of variable substitution

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25146#pullrequestreview-2829303278