RFR: 8292944: Noisy output when running make help the first time [v3]

[Magnus Ihse Bursie]

> From the bug report:
> Running make help after configuring produces a lot of noisy output from make before the actual help text is displayed.
> 
> Reproducer:
> 
> * bash ./configure --with-boot-jdk=... --with-devkit=...
> * make help
> 
> It only happens on the first invocation of make help, subsequent runs only display the actual help text. 
> 
> What happened was that the module-deps.gmk and find-test.gmk files where generated at an inopportune moment.
> 
> Note that this PR is dependent on https://github.com/openjdk/jdk/pull/23355 (I hope I got the Skara incantations right for that...)

Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:

 - Merge branch 'master' into fix-noisy-help
 - Add GENERATE_FIND_TESTS_FILE to RunTestPrebuilt as well
 - 8292944: Noisy output when running make help the first time
 - Update/clarify comments, and make some small style adjustments.
 - Rename BothInitSupport to LogUtils
 - Invert if block so the common case comes first. Also some additional cleanup.
 - Rename SpecInit to just Init
 - Remove Init.gmk
 - Remove InitSupport.gmk
 - Split InitSupport.gmk into three parts
 - ... and 1 more: https://git.openjdk.org/jdk/compare/5878e45a...887dd179

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

Changes: https://git.openjdk.org/jdk/pull/23357/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23357&range=02
  Stats: 19 lines in 5 files changed: 12 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/23357.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23357/head:pull/23357

PR: https://git.openjdk.org/jdk/pull/23357