RFR: 8347825: Make IDEA ide support use proper build system mechanisms [v2]

[Magnus Ihse Bursie]

> The idea.sh script which creates a configuration for IDEA does at some point call a makefile, to extract information from the build system. However, this is done in an ad-hoc manner that does not fit properly in the build system.
> 
> I ran into this as a problem when trying to implement another change, so this needs to be fixed, and should be fixed separately.

Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:

  Fix broken make:idea test

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23140/files
  - new: https://git.openjdk.org/jdk/pull/23140/files/2fddb64f..8bf76289

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23140&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23140&range=00-01

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23140.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23140/head:pull/23140

PR: https://git.openjdk.org/jdk/pull/23140