RFR: 8348039: testmake fails at IDEA after JDK-8347825

Mon Jan 20 15:57:44 UTC 2025

After JDK-8347825, `test:idea` started failing in the Oracle CI.

The problem is that when running in the Oracle CI, we are passing `CONF_NAME` to the topmost make. This will result in both `CONF_NAME` and `SPEC` being defined when making the nested make call in the idea.sh script, and this is not allowed.

I solved this the proper way, by unexporting the variables we have setup during make that could interfere.

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Commit messages:
 - 8348039: testmake fails at IDEA after JDK-8347825

Changes: https://git.openjdk.org/jdk/pull/23200/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23200&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348039
  Stats: 10 lines in 1 file changed: 6 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23200.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23200/head:pull/23200

PR: https://git.openjdk.org/jdk/pull/23200