RFR: Merge jdk22 [v2]

[Jorn Vernee]

> Merge JDK 22 branch into the master branch. The master will move to targeting jdk22

Jorn Vernee has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 18 commits:

 - minor cleanup
 - Merge branch 'jdk22' into MergeJDK22Master
 - Update jextract 21 with latest fixes
   
   Reviewed-by: jvernee
 - Merge branch 'jdk21'
 - Backport of 7903435: TestDocComments fails on Windows
 - Tweak build for JDK 21
 - samples fixes for JDK 21 panama API changes and version change.
   
   Reviewed-by: mcimadamore
 - Initial push
 - Backport: 7903449: Jextract generates structs that cannot be compiled
   
   Reviewed-by: mcimadamore
 - Merge
   
   Reviewed-by: jvernee
 - ... and 8 more: https://git.openjdk.org/jextract/compare/bd45c8b5...267e2497

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

Changes: https://git.openjdk.org/jextract/pull/208/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=208&range=01
  Stats: 3 lines in 3 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jextract/pull/208.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/208/head:pull/208

PR: https://git.openjdk.org/jextract/pull/208