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

[Magnus Ihse Bursie]

> 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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25146/files
  - new: https://git.openjdk.org/jdk/pull/25146/files/056e53e9..d44bb8b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25146&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25146&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25146.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25146/head:pull/25146

PR: https://git.openjdk.org/jdk/pull/25146